A joystick that protrudes from a man's pelvic region - if its
button is
pressed enough, can cause salty white ice
cream to come out, short circuiting the penis, and causing it recede to flaccidity.
Guy - "While playing Star Wars: Rouge Squadron II yesterday, my joystick
broke, so I pulled out my spare penis. But there were so many TIE fighters, and I ended up spilling my ice
cream all over my keyboard!"