The Sleepy Man Banjo Boys took the world by storm when they appeared on Letterman (video at the bottom of this post). Here are the three (probably home schooled) prodigious brothers putting Duelling Banjos through its paces. Watch past the minute mark. They start slow.
Sparks really fly in this second version though. Two Tesla Coils.
Here are the Sleepy Man Banjo Boys on Letterman – they explain their name at the end.