Answer:
When your undies attack you.
What starts with a 'P', ends with an 'E' and has thousands of letters?
Is infinity odd or even?
It increases and decreases yet no one see it. It is not a fire and yet it can be quenched.
Both cockroaches and illegal drug laboratories or syndicates do fear this.
Even if you throw it away, it still comes back.
Funny
Animal
Difficult
Easy
Food
Kids
Logic
What am I?