Sure just send it to this address: 1111111111111111111114oLvT2
it's well understood that nobody has the private key for this. It is the bitcoin address that corresponds to a public key hash of 0.
Ops, there are almost 3BTC there, seems that people are really destroying BTC's. ;-)
OP: Basically, you can just randomly generate a valid public bitcoin address (without the corresponding private key) and send the money there.