How did you have it locked? I ask because it looks from your picture that you have a U-Lock and a cable (?) which is what I use, and I had my bike parked in the same area for an even longer amount of time and worried every now and then that my bike might be stolen, because let's face it, this weekend was probably a good time for bike thieves.

Of course there's no foolproof way to lock a bike, but your story might motivate me to purchase one of those huge-ass chains.

Anyway, I'm sorry to hear this. I hope your birthday turns out well anyway, despite that loser.