A penguin, bored with the Antarctic weather, was on holiday driving through outback Australia when he started hearing a strange knocking sound from the car's engine. Knowing how dangerous it would be for a polar sea-bird to be stuck in the middle of the desert, he quickly pulled into the next service-station.
The mechanic took a quick look at the car, and said it would take a few minutes to find out what was going on. So, the penguin ducked into the shop and bought an ice-cream. Unfortunately the hot sun was melting the ice-cream, and penguin flippers are not the most dextrous of limbs, so he got as much ice-cream on his face as he did in his mouth.
Now rather annoyed, the penguin went back to the mechanic to see what was wrong. The mechanic looked at the penguin for a moment, and shook his head.
"Mate, I'm sorry, but it looks like you've blown a seal."
"No, no!", replied the penguin. "It's only ice-cream!"