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: my fuck up began when i agreed to go shopping with a my friend this morning on one of the busiest days of the year, boxing day. we were in one of the stores and i couldn't see my friend anywhere. considering i was done shopping, i went looking for her. i finally spotted her at the back of the store. i could tell it was her from a distance; she had a red jacket on with her brown hair swept over her left shoulder. i ran up behind her and grabbed her shoulders tightly and making weird noises to freak her out. it wasn't my friend. the horrified lady turned around and glared at me. i apologized, found my friend, and awkwardly walked out of the store.

TIFU by mistaking a stranger as my best friend