He he he slug.
When dp & I had just met I was living with two male friends. One Friday p.m. we (dp & I) skipped work early to have an all afternoon sesh (oh, those were the days). So we were going for it up in the bedroom when we hear footsteps on the stairs, and a knock. It was my flatmate asking if he could borrow a screwdriver (of all things). I said that he could, but that I was kind of busy right now, and he said OK. So we carried on where we'd left off.
After a few minutes we realised that we had not heard footsteps going back downstairs. No, he was apparently standing there waiting for the screwdriver!