"The Frog And The Loan" joke

A frog walks into a bank. He sees that the person at the front desk's name is Patty Whack. The frog says "
Patty Whack, I want to take out a loan for $30,000."
Patty Whack says "
What makes you think you can take that much money?"
The frog says "
My dad, Mick Jagger, knows the manager."
And he takes out a little pink elephant(not real though) for collatoral. Patty Whack takes it to the manager and says "
What is this?"
The manager then says "
Thats a knick-knack Patty Whack, give the frog his loan, his old-man's a rolling stone"
(funny isn't it)