Pro tip of the day: We’ve all seen boxers and football players get knocked out for a few seconds and then jump up and continue playing the game (hell, it’s happened to some of you reading this). But it’s all about how long you are out. Experts say if you’re ever out for more than five minutes, call a f**ken ambulance. There’s an awesome chance you have severe damage. Your brain may be bleeding on the inside. Yay!