A farmer is driving his horse-drawn cart with his dog in the seat. The horse is trotting too slowly for the farmer's liking so the farmer starts whipping it harder and more frequently.
So the horse says, "Stop whipping me like that! I'm not feeling well and I'm going as fast as I can." The farmer is shocked and says out loud, "Wow, I didn't know that horses could talk!"
The dog then says, "Yeah, neither did I."