Cock-Carding

The subtle art of dropping explicit pornographic playing cards in unsuspecting friends pockets or members of the public without there knowing.
For them later to find that what they was a there bank cards is in fact a hugely unsettling pornographic playing card. That usually creates a funny fit of laughter or a slightly more *shit-forget I still had them* reaction. Instead of throwing it away the Cock-Carded victim discretely puts it back in there pocket to view later.