The Tale of Two Farmers
A farmer went out to feed his cows one day and noticed that one of them was cross-eyed. Worried and stumped for a means to fix it, he called his friend who was the farmer next door. The farmer next door comes over and they both inspect the cow and start thinking what to do. The owner of the cow finally says, "well, I had a friend once with this same problem. What he told me is that he fixed it by shoving a hollow pipe up the cow's butt and blowing into the other end. And sure enough, that cows eyes were straight as an arrow!" The other farmer shrugged and they decided it was worth a try.
The owner of the cow went in back of the cow while the other farmer stayed infront to watch the progress. The farmer up front yelled to the other in back, "ok, now blow!" The farmer in back began to blow and blow. The farmer up front watched and reported back to the other farmer, "ok...harder..a bit more..its working..." Then suddenly the progress stopped. The farmer in front looked behind the cow at the other farmer and he looked exhausted. To give the farmer in back a rest, they switched places.
Now the guy up front waited....and waited...and waited...but nothing happened. He finally got annoyed and looked back at the other farmer. What he saw was that the other farmer was taking out the pipe and turning it around. The farmer that is now infront yells back, "Hey! whatcha doing?" The farmer in back looks at the other farmer in confusion and yells, "Well, you didn't expect me to use the same end that you did, did ya?"