I was having trouble with my computer.  So, I called Richard, the 11-year-old next door whose bedroom looks like Mission Control and asked him to come over.

Richard clicked a couple of buttons and solved the problem.

As he was walking away, I called after him and asked, "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."

Richard grinned, "Haven't you ever heard of an ID ten T error before?"

"No", I replied.

"Write it down", he said, "and I think you'll figure it out."

So I wrote down, ID10T.

I used to like the little guy.