The two brothers had a way of communicating over several miles by yodeling to each other. One particular yodel (ay-la-de-o-la-te-tu) signalled trouble, and meant for the other one to run.
Anyway, the farmer warned the two brothers not to mess with his daughter. The next morning the farmer was up before dawn, and caught his daugher in the bed with one of the brothers. He grabbed his gun and shouted that he would start counting, and if the guy wasn't out of his sight by the count of 5 he would shoot him.
Well the fellow high-tailed it out of there and was just jumping over the fence when the farmer hit 3. He yodeled the tune to warn his brother of impending doom, when the farmer suddenly shot him.
The other brother came running out of his room and said "what happened"? The farmer said "I caught your borther sleeping with my daugher and although I gave him a fair chance, before he was out of sight he yelled "I layed the old lady too", so I shot him.