Little Johnnie is sitting on the fence, watching a bull with two cows. The preacher walks up, and asks Johnnie what he is doing.

Johnnie replies, Im watching that bull fuck the black cow.

The preacher, aghast at the language, tells Johnnie that he should say that the bull is going to SURPRISE the black cow.

Johnnie says, OK. and the preacher leaves.

The next day, after church, the preacher is shaking hands with all the parishioners as they leave. When Johnnie appears with his parents, the preacher kneels down, smiles, and says, So, Johnnie, did the bull SURPRISE the black cow?

Johnnie replies, He sure did! He fucked the white one!