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: first of all, sorry for my english, i'm brazilian.  
a week ago, me and some friends gathered and my friend's house (a female, let's call her mary) to play some tabletop rpg. bear in my her parents were in a trip out of the country.
one of them brought along some marijuana, and 3, maybe 4 of them smoked a bit. mary's boyfriend (let's call him john) didn't smoke.
the next day, her sister went to visit her. she found the marijuana bit, took a picture and sent to their parents. they got really angry, and prohibited any of her friends to go there again.  
later that day, her sister's husband went to john's office, and sucker punched him. his office opened a police file against him, and johnd (my friend too) wanted to do so too.  
the sister's husband is a lawyer, so he threatened his mary that, if john opened a file, he would arrest all of us because of the marijuana.  
mary and john came to me, telling this. i told them that this makes no sense, and he absolutely can't arrest us for that, and the legal panel would laugh at his face if he tried.  
knowing this, john opened a file against him, and now mary's whole family are angry and pissed, demanding her to break up with him.  
if i didn't say anything, john wouldn't open the case :s  
now i don't know what to do.

TIFU by informing my friend of a simple law.