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I have just realised why the fellow here has such an odd facial expression. He looks pained because one of his testicles is trapped between the saddle and his leg. I know about this. This happened to a friend of mine who I was "helping" to ride a tandem. Due to his bad steering and my wrenching round his seatpost/rear-handlebar post as we fell in the bushes. His testicle recovered apparently. I couldn't stop laughing... so bad. This is a cautionary tale intended to prevent unwise use of tandems which merely diminish the status of the rear-rider sometimes called "the stoker" - a perjorative.
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