Answer:
It doesn't live within a house, nor does it live without. Most will use it when they come in, and again when they go out.
What goes in the water black and comes out red?
What comes once in a minute, twice in a moment, but never in a thousand years?
What is that over the head and under the hat?
Two bodies have I, though both joined in one. The more still I stand, the quicker I run.
Why did the stadium get so hot after the game?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?