A man in camo pants, always-in earbuds, a hat, and a...camera case? Recorder case? says "Did someone just get off computer 1? They left a can of Pringles." He brings it to me and I throw it away, but apparently it made him mad because he is now really frustrated with everything the computer does (or doesn't do). He keeps gesturing angrily at it and sighing dramatically, but whenever I make eye contact to try to offer help or sympathy he quickly looks away.
Update: Now he waves me over: "I've wasted fifteen minutes! I just want to watch the Flinstones!"