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: this happened about 6 years ago when i was 11. i had a neighbor who i was good friends with. he invited me to his house fairly often and we just played video games messed around like kids.

by the way, in my house we have locks on the doors and we always lock the doors, especially when there's people over.

my friend has a 16 year old sister.

you can probably figure out what happened. she was in the shower and i could hear the water flowing but i wasn't think coherently and i just walk in and she's standing there without any curtains and she screams and i just stand there for a moment shocked with my first glimpse of the female body irl (hehe). then i swing the door shut and go in my friend's room (which is right next to the bathroom) and just sit there and he knows what happened so he just sits there too and we're silent for a while. 

his sister and i never saw each other after that, thankfully, and i never got invited over again :(

edit: i forgot to mention that they didn't have locks on their bathroom doors

TIFU by walking in on my friend's sister while she was in the shower