That's not a crass headline. It is quite literal.
There's an indie game (not a video game, a literal game) called Swordfight. It asks players to buy old joysticks, strap them to their crotch using an S&M harness (complete with cuffs!) and, well, sword fight.
A circuit board hidden within registers "hits". Photographs of people playing registers "lulz".
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You can get the circuit diagram, along with helpful instructions on how to build your own harness and plenty more photos, at the link below.
Swordfight [Site, via IndieGames]