What exactly do you mean by "eat her cake?"

I wish I'd had your sisters revenge capabilities when my roommates ate my ENTIRE birthday cake while I was out of the apartment. They would have deserved it. I don't think you did. Unless...you didn't cut the piece out before anybody else was going to eat, right? Like, you didn't help yourself to someone else's cake before the party or anything?

Buy her another cake , present it to her, then toss it at her. Perhaps blueberry pie. Berries stain forever

Let's be honest, if your girlfriend was convinced that easily, she probably had her own suspicions or doubts long before this!

this just happend too me an hour ago, my gf's friend threatened to tell my gf that I was interested in someone else when that wasn't even true. I come to find out she said this so I would give her chocolate because she's on her period...

Anyone who takes the first piece of somebody else's birthday cake deserves everything they get.

Your sister is a savage... lol

Total over reaction but seriously what kind of dick takes the first piece of cake from someone else's birthday cake??

I'm not gonna say you deserve to have your relationship ruined over something so petty, but I will say that taking the first piece of someone else's birthday cake is just poor manners. Don't do that.

Okay but if you took my first cake slice I'd kill you so