Judd Apatow bullied Jay Baruchel into riding a roller coaster for the Knott's Berry Farm montage
Jay Baruchel is scared of roller coasters and didn't want to ride any of them for the Knotts Berry Farm montage from the beginning of the movie. But director Judd Apatow wanted everyone playing one of Ben's roommates to be in the montage so he basically forced Jay to ride one of the coasters. The movie shows Jay at the end of the ride repeatedly declaring that he has to get off. He wasn't acting when he said that.
https://www.youtube.com/watch?v=5WpwxeBmdbo&ab_channel=MarlonScott