How do you skidmark a pool table?

I'm baffled, quite frankly.

I can (barely) understand my own efforts, horrible though they are, but this one has me stumped. :?

I'm not going to try it myself, you understand-just curious.
It was one of those 'chocolate' brown labradors owned by Cuddles. Troubled by worms, it obviously thought it would get better anal friction on the pool table than on the carpet underneath so it climbed on before dragging its arrse up and down for a bit.

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