Little Johnny is standing on a street corner swatting mosquitoes.
Every time he sees a mosquito he utters, "Fucking mosquitoes, fucking mosquitoes."
Just as the boy says it, a shocked priest walks up and says, "You should not curse the mosquitoes because every one of God's creations has a purpose."
Little Johnny, unmoved by the priest's objection says, "Bullshit!"
"Well, tell me three things on this earth that God has made without a purpose," says the priest.
Little Johnny looks at him and replies, "Tits on a nun, Balls on a priest, and these fucking Mosquitoes."