That joke reminds me of the Rorschach Inkblot test joke.
This guy is at the psychiatrists getting tested. The doctor shows him an ink blot and ask what do you see?
The patient says 'Two dogs screwing'
The Doctor says, 'Hummmmmm'
The doctor shows him another ink blot and ask what do you see?
The patient says 'A donkey having sex with two women'
The Doctor says, 'Hummmmmm'
The doctor shows him another ink blot and ask what do you see?
The patient says 'A naked man having sex with a sheep'
The Doctor says, 'Hummmmmm You obviously are sexually perverse.'
To which the patient replies,'Hummmmm, Your the one with the dirty pictures'.

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