A Christian girl in love with a Jewish guy agrees to change her religion.
She goes to a Rabbi for instruction.
Rabbi: You will learn how to light the candles, keep two sets of dishes, keep a kosher home, and a few other simple things.
Girl: That sounds easy to me. I can do that.
Rabbi: The last thing is, you must go to a mikva.
Girl: Mikva, what's that?
Rabbi: It's a pool of water and you must immerse yourself completely for a few seconds.
Girl: I'm sorry, I have a phobia about putting my head under water.
I'll go in the pool but I can't put my head under water. Will that be all right?
Rabbi: That will be okay. You will be Jewish but you will still have a Goyisha kup.