If your "friend" whacks you in the face during a head-to-head match and smiles a shit-eating grin afterwards, well, that's not allowed.
Keep mischievous Leprechauns / drunken Irishmen away from the Wii at all times.
Your new Wii is worth $500 on eBay, so don't throw it out with the garbage / packaging by mistake. You should also avoid selling it at garage sales, as you really will make more for it on eBay.
Wiis do not require Gatorade after a long gaming session, regardless of whether you do or not.