Peeing in the snow

One winter day, Fred's neighbor Sam, came up to Fred's door and started
pounding on it.

Fred answered the door. "Sam, what's up?" he said.

Sam angrily replied, "That no good son of yours has been peeing in the
snow in my yard!"

Fred asked, "How do you know it was my son?"

Sam answered, "He wrote his name in pee!"

"Okay," Fred replied. "I'll talk to him about it, but I have to say, I
don't see what the big deal is. It's just pee in the snow. Why are you
so fired up about it?"

Sam snapped back, "It's in my daughter's handwriting!"

Thanks Ivan