Signed books and posters
Remember the Twitter feed Sh*t My Dad Says? Guy who posts the awesome things his dad says, like You seen my cell phone?...Whats it look like? Like two horses f*cking. Its a phone, son. It looks like a phone."
If you go to http://www.mydadsays.net
you can win signed copies of the guy's book about stuff his dad says. Its the first book generated entirely by Twitter, so even if you don't like it, you could probably sell a signed copy for a pile on eBay.
Maybe good for a late Father's Day!