Little Johnny is sitting in biology class, when his teacher states the fact that only humans stutter, and no other animal in the world does.

Johnny raises his hand and says. "You're wrong, Miss Finch!"

"Really, would you mind telling us why that is Johnny?" replies the teacher.

"Well, Miss Finch, the other day I was playing with my cat on the porch. The neighbors' Rottweiler came around the corner, and my cat went 'fffff! fffff! fffff!', and before he could say 'F**k!', the dog ate him!"