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 within the last 24 hours therefore i'm counting it as today. a week ago i had been redditing at work as usual, when i came across a random thread with comments abundant in jokes about people playing wonderwall on guitar. having been on reddit, for a bit of time i had noticed these jokes before but never got the joke. anyway i finally figured it out and since 4 chord songs are my specialty on guitar, i decided i'd better learn how to play wonderwall, hoping that one day someone will request a song and i can reply with "i don't know that one, but i could do wonderwall again".

anyway, fast forward to last night, my older brother (by a year) is having a party with a bunch of his friends and even though i wasn't technically invited, i know a bunch of his friends and i knew he didn't care if i hungout with them.

so a couple of his friends are over already, and i'm upstairs in my room, and i decide i'm going to impress his friends with my guitar skills. so i start playing wonderwall from my room (pretending i don't know his friends are here yet). 

i'm playing when suddenly i hear a shout from downstairs from one of his friends: 
"can i suggest a song?"
and me, completely forgetting why i learnt the song in the first place, just say "sure, but i don't know that many songs", to which the friend replies
"oh, never mind, i was just making a joke, but it's fine, you don't get it." 
and in my head i'm just thinking "shit! i wasted the best opportunity i had to make that joke" 

and then i sat there in shame for a while before joining the party.

TIFU by missing a golden opportunity