Something you weren't expecting.
This one time my dad was checking my sisters car parked in the drive way, Until he hears a rustling sound by his car. at first he thinks it is something in the bushes, but when he stares in that direction he notices his spare tire on the back of his car is moving unusually, and then it pops. He says "What the heck?" and he comes inside to tell me the story later that evening, and I thought to myself WOAH Shoe Hand.