By asking, "what are you doing?"
Sing "Rump titty rump titty rump titty rump Bonanza!
Rump titty rump titty titty titty rump titty rump titty rump rump rump!" Over and over.
Ask your co-workers mysterious questions, and then scribble their answers in a notebook. Mutter something about "psychological profiles." Some of my previous co-workers did that, so-called Psychologists!!!
always awkwardly stare at them until they look at you