How do you kill a blue elephant?
Shoot it with a blue elephant gun.
How do you kill a red elephant?
Strangle it till it turns blue, then shoot it with a blue elephant gun.
How do you kill a green elephant?
Tell it a dirty joke until it blushes and turns red, then strangle it until it turns blue, then shoot it with a blue elephant gun.
How do you kill a yellow elephant?
What are you talking about? There are no yellow elephants!