Oidz

[lugsy]

You know those magnets tht go BZZZZZZZZZZ when you chuck them in the air together, how do they do tht ?

[Chappers]

Ooh I know this one!

Because the magnets are oval in shape, only a very small surface area can touch. This means that they don't have enough surface area to stick together strongly so they bounce off and reattract again. The buzz you hear is the magnets rapidly touching, bouncing off and reattracting again.