★°Who tell me a cool joke?

The penguin was bored, so he went to polar bear's house to play with him. After twenty years of alking, at the equator, the penguin haddenly remenbered that he forgot to close the door, so he went back, and closed his door, and restart his journey. Within forty years, the penguin finally reached the polar bear's house. He knocked the door,

"Hi, Polar bear,come out, let's play!"

"NO!", the polar bear answered.

Then the penguin left.