I was having trouble with my computer. So I called Rick the computer guy, to come over. 
Rick 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?" 
"No," I replied. 
"Write it down," he said, "and I think you'll figure it out." 
So I wrote out ...... I D 1 0 T