<human>: Could you distill the essence of the text into 1-3 sentences?

Today I got a text from a friend telling me that a co-worker had written 'fucked up shit' on some restaurant comment cards and used my real name with real information. The co-worker didn't tell my friend what he wrote, just that it was fucked up and was to get back at me. 

The funny thing is I've never done anything to this co-worker, and in fact most of the other employees also think he is weird. I'm pretty sick of his shit and am looking to figure out the best way to approach a counter attack. So far that plan is talking to the head supervisor about it and play the "identity theft" card, but Reddit always has some creative ways of getting things done, so I figured I'd come here first.

I also haven't approached the guy about it because when I do, I'd like it to be by surprise and don't want to tip him off that I'm thinking about reporting him.

Anyone got any ideas on how they'd do this?
<bot>: Co-worker wrote personal information about me and fucked up shit on comment cards at restaurants, I'm pissed about it, I'm looking for ideas on how to make the shit hawks fly.