#1 : wanna hear a joke?
#2 : sure
#1 : how do you kill a blue elephant?
#2 : I don't know
#1 : with a blue shotgun
#2 : oh lol...is that it?
#1 : nope, how do you kill a green elephant?
#2 : with a green shotgun
#1 : yep, how do you kill a pink elephant ?
#2 : with a pink shotgun
#1 : nope. Tell him to hold his breath until he turns blue then shoot him with a blue shotgun.