I didn't put thread lock for the 2 rear toe in links screws, this was the mini Revo, I was gunning it full throttle and one of the screw backed it self out and the rear toe link pop out, luckily enough there wasn't any damage at all except the missing screw and a heart attack[:'(].

Probably not related to RC but I used to have a scooter with disc brakes on, didn't know what the heck I was doing back then spraying WD-40 on it, going to an intersection and "WHAT THE **** IS WRONG WITH MY BRAKES!!" Lesson learned.