I'm sorry, but how are the other replies to you defending this behavior...?

I have never "accidentally" eaten an entire lunch that wasn't mine. I'm actually offended that people are defending this. It's stealing. It's petty, childish, dishonest behavior. I think I would just be dumbstruck speechless if a coworker actually was brazen enough to just take my food and eat it. It's comically absurd.