She seems to have some invisible tough s**t

The story:

Listening to the radio on a cross-country car tour with a Navy buddy and two women we met in Australia. I don't sing out loud very often, so that in itself was a surprise. However, I didn't get why everyone was laughing so hard...until one of the women explained the actual lyrics. I was so convinced she was wrong that it took 20 minutes with a tape playing it back over and over before I believed it...wasn't that embarrasing since I did that about a year later...25