Sometimes we have trouble with our computers.

I had a problem yesterday, so I called Eric, the 13 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 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.'
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 work it out.'
So I wrote down:
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ID10T

I used to like Eric, the little bastard.