He and his wife meet their friend Bill on the street and the husband says to him, "Bill, you just have to take this incredible memory course my wife and I just attended, it's fantastic! You won't believe the improvement."

Bill says, "Wow, great, what's the name of the course?"

The husband turns to his wife and asks, "What's the name of that flower? You know the one with the long stem and the thorns?"

"You mean a rose?" his wife replies.

"Yeah, that's it!" (pause)

"Rose, what was the name of that memory course?"