A traveling salesman's car breaks down, and he walks over
to a near by farm. He knocks on the door and the farmer
appears. 
"Excuse me sir, but my car broke down about a mile down
the road, and I was wondering if you had a place I could stay,
just until morning, and I....." 
The farmer says, "Well, I can let you sleep in the barn, but
you'll have to sleep with my two sons...." 
The salesman says, "Sons! I must be in the wrong joke!"