Valued customer: Hi, sorry, I was wondering if you could help me, I'm having a little problem with the computer. I can't find my icons when I log in.
Me: [looks up from furiously typing and staring at the screen with great intensity]
Valued customer: Oh sorry, you must be really busy, it's okay, it can wait.
zen-like suggestion, basically, 'have you tried logging out and back in again?']
Valued customer: Oh, I'll try that!
[twenty minutes later]
Valued customer: I don't know what you did, but thanks, it's working again!
I've never watched an episode of The I.T. Crowd