Har, har! A joke, via Breaking Windows:

I was having trouble with my computer. So I called Harold, the computer guy, to come over. Harold clicked a couple of buttons and solved the problem. He gave me a bill for a minimum service call.

As he was walking away, I called after him, “So, what was wrong?”

He replied, “It was an ‘ID ten T’ error.”

I didn’t want to appear stupid, but nonetheless inquired, “An ‘ID ten T’ error? What’s that, in case I need to fix it again?”

The computer guy grinned. “Haven’t you ever heard of an ID ten T error before?