A frog goes into a bank hoping to borrow some money. The teller introduces herself as Patricia Whack and proceeds to ask him a few questions. It turns out he is Fred Jagger, son of Mick Jagger. Fred asks for a million dollars and Patricia is taken aback. She asks for what collateral Fred has to put up for security in case he can't pay the money back. He pulls out a tiny white, china elephant and places it on the desk.
Patricia knows it can't be worth very much and takes the ornament into the manager to approve or decline the loan. The manager checks the ornament and paperwork. Without further ado, he looks up at Patricia and says "It's a knick knack, Patty Whack, give the frog a loan. His old man's a Rolling Stone."
A platypus lays eggs and produces milk - it can make its own custard