A guy walks into a bar and asks the bartender if he will hive him a free beer if he shows him something amazing.  The bartender agrees, so the guy pulls out a hamster that begins dancing and singing "Tuff Enuff" by The Fabulous Thunderbirds.

"That IS amazing!" says the bartender, and he gives the guy his free beer.

"If I show you something else amazing, will you give me another beer?" the guy asks.  The bartender agrees, and the guy pulls out a frog.  Now, the hamster plays piano while the frog dances and sings "You Ain't Seen Nothin' Yet" by Bachman Turner Overdrive.

The bartender, completely wowed, gives the guy another beer.  A man in a suit, who's been watching the entire time, offers to buy the frog for a princely sum, and the man agrees.

"Are you nuts?" asks the bartender.  "You could've made a fortune off of that frog!"

"Can you keep a secret?" asks the man.  "The hamster's a ventriloquist."