Because he felt jumpy!
Get it? Kangaroos jump. The kangaroo felt jumpy (like a human might feel jittery or unsettled), so it went to the doctor.
A pouch potato!
Get it? A lazy person is often called a couch potato. A baby kangaroo lives in its mother's pouch, so it is a pouch potato.
The elephant has a better memory.
Another option (as long as the other person says "I don't know"): I won't let you guide me at the zoo!
They kept eating potato chips in bed!
Get it? If the children eat potato chips in bed, that means crumbs will be in the mother's pouch!
The zookeepers kept building a higher fence, but they always forgot to lock the gate!
Get it? The zookeepers thought the kangaroo was jumping the fence, but he was leaving through the gate.
select one here...