On a scale i 1 to 10 ,how stupid is this joke...?!

On a scale i 1 to 10 ,how stupid is this joke...?

A guy walks into a bar and orders a beer. "Listen," he says to the
bartender. "If i show you the most amazing thing you've ever seen, is
my beer on the house?" "We'll See," says the bartender. So the guy
pulls out a hamster and a tiny piano out of a bag, puts them on the
bar,
and the hamster begins to play. "Impressive," says the bartender, "but
i'll need to see more." "Hold on," says the man. He then pulls out a
bullfrog, and it sings "Old Man River." A patron jups up from mhis
table and shouts "Thats's Absolutely incredible! I'll give you $100
right now for the frog." "Sold," says the guy. The patron takes the
bullfrog and leaves. "It's none of my business," says the bartender,
"but you just gave away a fortune." "Not really," says the guy. "The
hamster is also a ventriloquist."

Good joke, well told (well written, I suppose). I'd give you 8.5 out of 10. I hope that's enough.