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: so this happened about eight months ago, but its still the most idiotic thing i've done. i had forgotten my fixed blade knife at my friends house ( we were filming a horror story) so she brought it to school. now, since the school doesn't allow weapons, i just placed it into my jacket pocket and forgot about it. that same day, my two friends and i went to hang out at the park. i was going down a slide when a i felt a sharp pain on my upper thigh. thinking nothing of it since it went away, i stood up and turned to go back up the playground when one of my friends told me i was bleeding. twisted to look at my thigh and there was a steady red spot expanding rapidly. my knife, which doesn't have a sheath, and stabbed me through my jeans and jacket. since im an idiot, i went home instead of the hospital. while i was cleaning my wound i found out that i could first see my fat and that the wound was about 1-2 inches wide. so i finally told my dad and we went to the hospital. two stitches later we were driving home when he asked what happened. i didnt want my knife taken away so i lied and said something on the slide cut me. ( not a total lie) that resulted in my mom and her co-workers examining the playground when they walked home for lunch and such. the good news is i kept my knife!

TIFU, by forgetting about the knife.