A day at amusement parks like Disneyland and Six Flags is usually a mix of endless waiting in line and a few short minutes of pleasure - but sometimes the ultimate nightmare of riders comes true and rides break, causing horrible accidents. What are the worst amusement park accidents? Many people fear the incidents that are on this list. Roller coaster cars flying off the tracks, harnesses not working properly, and cables coming loose.

Most amusement park rides get your adrenaline pumping but are completely safe. Occasionally though, there is an all out disaster where the machinery goes crazy and someone loses a limb or dies. Whether due to malfunctioning or park-goer error, these amusement park disasters have certainly scarred these people for life.

The accident at the Dreamworld theme park at around 2.20pm local time sent two people flying from the carriage and left two trapped inside. Typically regarded as a family friendly - or “moderate.

The most horrible amusement park accidents, tragedies, and fatalities that have ever happened appear on this list, leaving us to wonder why so many onlookers took out their camera phones instead of helping.

In July 2017, a ride at the Ohio State Fair in Columbus malfunctioned, killing one man and sending at least seven others to the hospital. The ride - called the Fire Ball - malfunctioned, sending two people airborne and causing more to crash on the platform below. Ohio Gov. John Kasich said the state is investigating the crash.

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Warning: the video of the incident (found here) is very hard to watch.

Four people died on Thunder River Rapids Ride at Dreamworld, Australia's biggest theme park, on October 25, 2016. Accounts of the accident don't immediately make clear how the victims died; two were ejected from the ride and the other two trapped on it, though what actually killed them remains unclear.

Three of the four victims have been identified. Two were siblings: Kate Goodchild, brother Luke Dorsett, his partner Roozi Araghi. Their mother, Kim Dorsett, said, “I have three children and have lost two of them today.. I have two granddaughters — an eight-month-old and a 12-year-old — and it truly breaks my heart to know that my eight-month-old is never going to get to know her mum.”

According to an eyewitness, at least one of the victims drowned, while children nearby screamed. 'There were kids onboard screaming while their mum was trapped under. I’d rather not talk about what I saw,' a man recalled.

Claire Wooley, another witness, said “She just kept screaming ‘Where’s Mummy? Where’s Mummy?”

No reason for the incident was given other than a 'malfuction.' The park, located about 30 miles south of Brisbane, on Australia's Gold Coast, shut down operations the day after the accident, out of respect for the dead.

Ten-year-old Caleb Schwab tragically fell to his death in 2016 while riding the Verruckt - a waterslide at Schlitterbahn Waterpark in Kansas City billed as the tallest in the world. Witnesses said that Caleb's raft went airborne and hit the netting over the slide after coming down the first 168-ft tall slope at roughly 60 mph.

Other riders had reported earlier that the slide's safety harnesses had not been working properly that day, although police and park officials did not say exactly how Caleb had died. Caleb was the son of Kansas State Rep. Scott Schwab, and was at the park with his family to celebrate 'Elected Official Day.'

On June 14, 2018, the Sand Blaster ride in Daytona Beach, FL, derailed, sending two riders on a 34-foot plunge to the ground. Two other riders were hanging in another car. Six of the 10 passengers were sent to the hospital. There were two trauma alerts for the people who fell, which means their injuries could potentially be serious. Firefighters rescued the patrons stuck on the derailed coaster.

Spokesperson Jennifer Meale released a statement to the media regarding the accident:

First and foremost, we're concerned about the individuals who were injured last night. Their well-being and recovery is of the utmost importance. Anyone who should be held accountable will be held accountable.

Meale revealed that the ride had previously failed two inspections in May, but the issues were resolved before the incident. In fact, the ride had been tested the morning of the accident and passed the inspection.

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Ridge racer unbounded trainer. Two people were killed and two others were injured after the last car on a roller coaster derailed and plunged to the ground Saturday at an amusement park in Mexico.

It happened around 1 p.m. at the La Feria de Chapultepec amusement park, located in Mexico City, according to the Mexico City attorney general's office.

Ulises Lara López, a spokesman for the attorney general's office, told reporters at a news conference that two men -- ages 18 and 21 -- died in the crash. The two men sustained head and other injuries when the car derailed, according to officials.

Two women -- ages 27 and 35 -- were also injured in the crash. One of the women had a leg injury that required surgery, while the second woman had a severe brain injury that required her to be intubated. She is listed in serious condition, officials said in a news release.

Witnesses told local media outlets the victims were sitting in the last car of the roller coaster as it derailed. Video obtained by Mexican news outlet Milenio shows the moment the car derails as the roller coaster train enters a tight turn.

Rosalba Rodriguez, who witnessed the crash, told reporters there was nothing out of the ordinary about the ride, which had completed a few loops until the last car derailed during a turn near the end of its run.

The amusement park where the derailment took place, in Mexico City, Mexico, in this still image taken from video Saturday. (Reuters TV via REUTERS)

A preliminary investigation has indicated a mechanical failure caused the car to come loose and fall from a height of 33 feet above the ground, according to López.

Investigators were treating the derailment as a case of negligent homicide.

'This is now in the hands of prosecutors, and prosecutors have already taken the necessary steps for an investigation,' Miriam Urzua, an official from the civil protection organization, told Reuters news agency.

The popular park closed shortly after the crash, as the fair said it 'deeply regrets the terrible accident' and is investigating, Sky News reported. Video showed investigators milling around the park as a tarp on a frence blocked a view of the area under the roller coaster where the derailed car crash-landed.

The towering Quimera coaster in Chapultepec Park can be seen from afar in the capital, it's three nearly vertical yellow and red loops visible from a major highway.

The decades-old coaster, like many rides in La Feria, was featured at other parks around the world before finding a home in Mexico City.

The Associated Press contributed to this report.