Answer:
When is homework not homework?
How do you drop an egg and never break it?
The yellow house has yellow window, the red house has red windows, what colour windows does the green house have?
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
What moves and touches water but doesn't get wet?
What is always coming but never arrives?
Logic
Animal
Difficult
Easy
Food
Funny
Kids
What am I?