I had to track down a really old part for a really old computer system, so I spent the afternoon driving from one computer store to another to rummage their back rooms and scrap bins.
I'm leaving one in the mall, empty handed, and run into a guy from another department. "Hey, how's it going, blah blah blah, gotta run!"
When I get back to work an hour later I have a voicemail from way up the chain, asking why I was in the mall shopping instead of at work. I call the guy back, tell him about my little project to revive a 25 year old computer for a client, and he apologizes.
He then asks me what the other guy was doing in the mall. "I dunno sir, but he had a bag from 'The GAP'.
Busted.