I was having trouble with my computer. So I called Eric, the 11 year old next door, whose bedroom looks like Mission Control and asked him to come over. Eric clicked a couple of buttons and solved the problem.
As he was walking away, I called after him, 'So, what was wrong? He replied, 'It was an ID ten 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.'
Eric 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 Eric, the little bastard