Transubstantiation and Elvis

I like this quote (H/T Bert):

If you wake up tomorrow morning thinking that saying a few Latin words over your pancakes is going to turn them into the body of Elvis Presley, you have lost your mind. But if you think more or less the same thing about a cracker and the body of Jesus, you are just a Catholic. -Sam Harris

I wonder how many Catholics actually believe the bread and wine turn to the body and blood of Christ...