Judy, the editor of a trivia publication, was having
trouble with her computer. So she called Dave, the 
computer guy, over to her desk. Dave clicked a
couple buttons and solved the problem.
As he was walking away, Judy called after him,
"So, what was wrong?"

And he replied, "It was an ID ten T error."

A puzzled expression ran over Judy's face.
"An ID ten T error? What's that..in case I need
to fix it again??"

He gave her a grin, "Haven't you heard of an ID ten T
error before."

"No," replied Judy.

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

She wrote: ID10T