Colonoscopy

A guy went into his proctologist's office for his first rectal exam. The nurse, Evelyn (new to the job), took him to an examining room and told him to get undressed and to have a seat until the doctor could see him... She said that the doc would only be a few minutes.

After putting on the gown that she gave him, he sat down. While waiting, he observed that there were three items on a stand next to the exam table:
A Tube of K-Y jelly
A rubber glove
And a beer

When the doctor finally came in he said, "Look Doc, I'm a little confused. This is my first exam.
I know what the K-Y is for
And I know what the glove is for,
But can you tell me what the BEER is for?"
At that Doctor Paul scrunched up his face in irritation and stormed over to the door
He flung the door open and yelled to his nurse ..
Darn it Evelyn !!!

I said a BUTT LIGHT!