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: tifu by going to the doctor and getting an xray on my knee and finding out i gave myself a stress fracture; serious wtf moment.  after losing 25# by getting up off the couch about 3 months ago i've been progressively running more but nothing huge, been building to a 5k time of 28 min as a 6' 220# mid thirties gent.  out for a mind-clearing jog (not a run even) last week and stated getting shooting pains below the left knee.  got progressively worse day by day even with rest and only necessary walking.  now i'm making friends with a couple crutches.   haven't even been able to run an official 5k race yet - guess my dream of becoming a marathoner is on hold.

TIFU by dreaming of being a marathoner.