Jerry was just coming out of the store with a bag of groceries when he bumped into Ken, a local horse breeder.

"Hey, Ken. How's that record breaking filly of yours doin'?"

"Not so great." replied Ken. "She was winning practically every race I put her in. Then she started getting tempermental. It got so when I raced her in the evening, she would win handily, but when she raced during the day she would come in dead last."

"What did you end up doing?" Jerry asked.

"Well, I consulted the top veterinarians and horse psychologists to no avail. I finally had to give up on her because she had become ... a real night mare."