In aviation terminology, an RTO, or rejected takeoff, is when an aircraft must abort a takeoff due to suspected or actual airplane malfunction that would affect it during flight.

The video above simulates a break test on an Airbus A380 (currently the largest passenger jet in operation) during RTO. As you can see, the brakes completely burst into flames due to the immense heat that is generated from stopping a fully loaded A380.

Below is a video of a RTO performed in a Boeing 777 jet on an actual runway. This test was performed to simulate a real-life emergency where the brakes would remain on fire until fire crews were able to reach the plane.

Now I know why they have you put on seatbelts. It’s not to save you in the event of a crash. It’s to save your face from the seat in front of you in the event of an RTO.