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 sunday night, so not quite today so screw it.  also not using a throw away because i believe people should own their shit.  

so sunday night me and my girlfriend had just returned from a weekend trip quite late, but we had a fantastic time.  went to a festival on the other part of the country (uk), spent some time together away from everything.  it was great.  travel was a bit of a bitch, but what can you do.  

so we get home and relieve the dogsitter who goes home, spend time fussing the pooch, making sure everything is still in place and just curl up together for a while.  your typical slow burner petting turning into something else going on here.

now i'm not going to waffle verbose about all of that business because frankly we get enough of that in tifu to make literotica look bad.  but as we were having sex, we were both getting more into it, getting more aggressive and really passionate.  now, i know she has a thing for liking hands on her throat, and occasionally being slapped whilst i'm on top.  it works for her, works for me, it's us.  so i do this.  three times, as she's climaxing, and three times quite hardly.

watching the change in state as she goes from happy post-coital bliss to full blown crying was one of the most guilty things i've had to experience.  holy shit, something has gone wrong here.  halp.  

i apologise and help her up, and then hold her for about a half hour whilst she calms down, apologising all the time.  her face was really, really red on the one side, but thankfully didn't bruise or this could of gone quite differently.

welp, no more getting carried away for me.

TIFU by slapping my girlfriend in the face hard.