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!"