What is big and grey and counts to 10 backwards?
An elephant with hiccups.

What is big and grey and covered in fur?
An elephant in a mink coat.

What is big and grey and flies?
An elephant in a helicopter.
What else?
A jumbo jet.

What is big and grey and goes bleep, bleep?
An elephone.
What else?
A telephant.

What is big and grey and goes clump, clump, swish, swish?
An elephant with flippers on his back feet.

What is big and grey and goes crunch, crunch?
An elephant eating potato crisps.

What is big and grey and goes round and round?
An elephant stuck in a revolving door.

What is big and grey and goes slam, slam?
A two-door elephant.

What is big and grey and goes up and down 20 times a day?
An elephant doing press-ups.

What is big and grey and good at sums?
An elephant with a pocket calculator.