This is something I screw around with (polka that is). There's nothing more satisfying than seeing the look on a persons face when you play them a heavy metal song with polka section in the middle. This riff can be played by a bass or guitar, or both at once. Lots of fun. Good luck.

D|----------------------------------------------------|
A|---5---5---10---8---7---5---5---5-------------------|
D|-0---4---8----7---5---3---5---2---------------------|