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.

Let me give you an example: Text: title speaks for itself really... 
i just wasted $1500 of my parents' money.
i feel terrible.

edit: i guess it wasn't that i took the wrong class, but the class i was taking wouldn't transfer credits over to my university. so really it was my negligence to do more research in the matter. gg
The answer to this example can be: TIFU by taking the wrong class for 2 weeks and only realizing it today
Here is why: This title is appropriate for the given text post because the focus of this post is about a humorous situation caused by "taking the wrong class".

OK. solve this:
Text: so this didn't happen today and i'm only going to write it as short as possible because i wrote it out full length and my shitty computer fucked itself... so.. i cbf now but it is nsfw 

anyways background, my bf lives in a granny flat at the side of his house and on this occasion we were going to pick up his brother and some mates from the club half an hour away at around 2ish. it was getting late so i didn't think anyone was up, so didn't bother locking the door when things got a little... heated.

anyway his mum decides to come out to make sure he knew to 'be safe' ironically at the same time things were about to peak... and we heard her coming... but a bit too late. i gave bf the look of fear and just said "... the door!" he went into full panic mood but managed to shoot me a "this is all your fault" look before i ran to the door to lock it, but she got there right as i was about to... so i dove behind the door while bf flung a blanket over himself so it looked like he was only half naked.

so i was hiding behind the door butt naked, standing on my tippy toes so as to not bump the door... while his mum is having the conversation of her life making sure he knows she loves him, and talking about the movie that was on (that we weren't watching)

at one point she even gives him a fucking hug (i could see him on the bed from where i was hiding and was like dear jesus she better not look this way) and all i could think about was how fast his boner much has disappeared when she gave him a hug and how awkward he must feel. this to me was hilarious and i almost started giggling about the whole situation (i laugh when i get nervous which doesn't help) i manage to stop myself from laughing because i remembered im still here... everything out in the open behind a door.. balancing on my toes (which by now stung like shit.. it'd been like 20 mins and my calves were starting to burn...)

anyway as if shit wasn't bad enough she asks where i am. bf accidentally looks towards the door and we make eye contact and i can see he is having trouble thinking of anything believable... in the end he settles with "i think she went to the toilet" and she replies she has been inside and didnt hear me come in, i can see him panicking.
she goes to shut the door and i'm sure i'm about to come face to face with her and we're both gonna die... luckily she goes "i might close this on my way out.. i don't like open doors but i'll make sure your gf is okay"

she leaves (thank fucking christ)

we instantly lock the door and shove clothes on... i then open and shut the door so she hears me come 'back' from the toilet... which should be impossible because she just took the only entrance to the main house...

next second we get a phone call on bfs phone. it's his mum. i answer. she asks where i've been. me being a better liar, come up with a convincing brief story that i left my phone in the car, we laugh about how bf doesn't listen to me well enough to hear that "going to the toilet" sounds different to "getting my phone"

life saved. we live another day (and yes.. this is the short version)
Answer:
TIFU by not locking the door to my bfs room (NSFW)