HA! Love it!
Lets just say:
So my friend finally buys a mac after me convincing him that macs are seriously the best computer to have! He gets his mac home with the preloaded Leopard on, finds out that what people complain about most about Leopard is happening to his computer. Now after convincing him to get a mac, he is finding reason to hate macs since Windows worked for him perfectly(vista). He is hating the mac experience and is ready to get rid of it and go back to his PC with perfectly running Vista.
1. Take advantage of the situation buy the computer from him for a discount of course (I see 1/2 off sale coming)
2. Let him suffer and complain about Macs until an update comes out and hopefully he still likes the mac after all the bugs
3. Give him my copy of Tiger to HELP apple in converting a member of our mac cult and keeping him to buy more apple products because he finds that Tiger is awesome and loves macs and tells everyone about macs and how everyone should get a mac and he wants to marry his mac.
Oh but wait! Sorry, I cant give you my copy of Tiger because of the User agreement. One copy, one computer. So instead he is stuck either getting rid of the mac and telling everyone his mac experience was terrible and reinforces himself and others that PCs are better then macs
Or...
4. He can just install Windows on it, and keep using it as a PC that can also run Mac software.