Unintentional Goatse on the London Underground

This "Don't hold the doors open" poster from the London Underground is as fine a specimen of "unintentional Goatse" art as you could hope to see. So fine, in fact, that one wonders how unintention it is.

Link

(Thanks, Patrick!)

See also:
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Goatse t-shirt design

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Goatses in the media
Hidden Goatse in Unreal Tournament 2004
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GOATEA.cx