The car hit a bump and jumped into the air. I did the same, yelping as my head hit the roof before the car and I crashed back down. Source: Destiny Kills - Book 1. By Keri Arthur.
It could be used figuratively as well, meaning that the person doesn´t know what the car hit, say at some rainforest road. The car hits a bump (because the impression is that it hit a bump), but then it turns out to be a big snake!