Definition: In this task, you are given a Reddit post as a text. Your task is to generate a title for this text. The title should start with "TIFU by", followed by a situation that caused humor. The title should contain 7-12 words, ideally.
Input: Text: a little background. i'm a high school student who has play football for a while now, so i'm not inept when it comes to gym knowledge. i've been going to the school gym for a while, but have recently decided to quit football and have started going to the local gym.

now, onto the tifu. i went to the local gym as my normal routine, and went on with my workout. i burned through each set without a clue what would happen next. i checked my phone for the next workout within the program i was doing. overhead slam. easy enough, i thought. i had done this in my old school gym before. you take a medicine ball, which is simply a weighted ball, raise it over your head, and slam it onto the ground. so i walked over to the rack, and grabbed the ball. going over to the soft ground, i lift the ball above my head, and slam it onto the ground. "what the fuck?" my mouth is bleeding. the ball bounced right back up with a full force and hit my straight in the upper lip. 

you see, back in my old gym, their medicine balls were filled with sand. they didn't bounce at all. i hadn't bothered to notice that these balls were pumped full of air and didn't have a grain of sand in them. so when i slammed the ball onto the ground, it came right back up like a basketball, except with a full 30lbs of force. 

my mouth didn't bleed too much, and it doesn't seem that bad. only my upper lip has been damaged, and it seems like it's only affected the skin. the inside of the lip is completely red and peeled, and is extremely swollen. it doesn't hurt that much right now, but we'll see. i know it's not that bad, but i thought it was worth writing a tifu for. hopefully i won't have a lisp during class tomorrow.

TIFU by using a medicine ball.