copied from the internet... enjoy:

"I was buying a large bag of Purina at Wal-Mart for my Golden Retriever and
was in line to check out. A woman behind me asked if I had a dog. On
impulse, I told her no, I was starting The Purina Diet again, although I
probably shouldn't because I had ended up in the hospital last time.
However, I had lost 50 pounds before I awakened in an intensive care  ward
with tubes coming out of most of my orifices and IVs in both arms.  I told
her that it was essentially a perfect diet and that the way it  works is to
load your pants pockets with Purina nuggets and simply eat  one or two every
time you feel hungry. The food is nutritionally  complete so I was going to
try it again.  I have to mention here that practically everyone in the line
was by now enthralled with my story, particularly a guy who was behind her.
Horrified, she asked if I'd ended up in the hospital in that condition
because I had been poisoned. I told her no; it was because, "I had been
sitting in the street licking my balls and a car hit me."  One guy was
laughing so hard as he staggered out the door, I thought he was going to
have a heart attack.