Sometimes I do it to myself

So I’m walking into my office this morning and I notice a couple co-workers of mine staring down at me from the 6th floor window. Thinking they’re making fun of me, I jokingly give them "the finger". But I get no reaction. Turns out they weren’t looking at me. I look down a bit and notice a guy I don’t know staring down at me from the 5th floor window.

Oops.