How to apologize to my girlfriend after giving her a really bad wet willy?

It was probably too much but it seemed like a good idea at the time. We always mess around like that and I've done it before and I know she HATES it and always gets mad but always gets over it after I make her laugh. This time it was really bad though...like a really nasty one and she's still mad. I've said sorry a bunch of times but she's not hearing any of it. Even flowers and chocolate didn't help. Should I be getting ready for a break up?

That would suck to lose my girlfriend over such a silly thing lol. I still think it was funny though.
How to apologize to my girlfriend after giving her a really bad wet willy?
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