Answer:
It increases and decreases yet no one see it. It is not a fire and yet it can be quenched.
Some are clean and some are dirty, but all are meant to get a chuckle. Most like it, some takes offense from it.
It describes an era in history during which lights was hard to come by.
It will not die when hung, and will dry when wrung.
Why do cats make good soldiers?
What made Cyclops quit teaching?
Funny
Animal
Difficult
Easy
Food
Kids
Logic
What am I?