Jerry is hired to play his trumpet on the score of a movie, and he's excited.
He's especially thrilled because he gets to take two long solos. After the
sessions, which go great, Jerry can't wait to see the finished product. 
He asks the producer where and when he can catch the film. A little 
embarrassed, the producer explains that the music is for a porno flick 
that will be out in a month, and he tells Jerry where he can go to see it. 
A month later, Jerry, with his collar up and wearing glasses, goes to the
theatre where the picture is playing. He walks in and sits way in the back, 
next to an elderly couple who also seem to be disguised and hiding. The
movie starts, and it's the filthiest, most perverse porno flick ever...
group sex, S&M, golden showers...and then, halfway through, a dog gets
in on the action. Before anyone can blink an eye, the dog has had sex 
with all the women in every orifice, and most of the men. Embarrassed, Jerry
turns to the old couple and whispers, "I'm only here for the music." 
The woman turns to Jerry and whispers back, "We're here to see our dog." 

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