Another (might have been seen before but made me laugh):
My wife was driving to the city, and I was at home watching the TV news.
I heard that a car on the freeway she was taking was going the wrong way and causing havoc so I thought I'd ring her to warn her.
I said:
"Honey, be careful, there's a car going the wrong way up the freeway"
She answered:
"A car? There's hundreds!!!"