Some people reply to 419 scammers and play them along, wasting their time, seeing how absurd they can get in their replies before the scammer realises they are being mucked about and goes away.
This is one of the best exchanges I've seen. My favourite part is when a delay in replying to the scammer is explained like this:
Dear Cynthia,The scammer replied.
I got lost in a forest this week-end, and some wolves did attack me, and that’s why I’m late in responding you.
Don’t worry, I’m not wounded. But I was very scared. I have never been attacked by wolves before.
What is the name of the person I have to send money to?