How long is a couple of days?

A recent cartoon at http://xkcd.com/ reminded me of a trip to Canada to visit my sister.

The boarder guard asked how long I would be staying.

A couple of days I said.

When are you retuning?

Friday.

Wait a minute, he challenged, that's four days from now and you just said a couple of days.

Yes, I said, a couple of days for me includes 2 or 3 or 4. I'm not strict about it always meaning 2.

Bottom Line

Imagine being stopped at the boarder for incorrectly using the word "couple".