I was having lunch with a friend today and he told me about this. He and his wife were getting into their car in a parking lot and his wife started laughing. He asked her why and she just said "Get in the car". After they'd sped off, she explained that without trying to she'd overheard the woman a few cars over talking on her cellphone, but had only made out this one sentence:

"So he told me to say it was just a gentle fart, but I told him that I could never tell a judge that with a straight face."

Now I have to say, I'd love to know the context for this statement!