T-Shirt Cannon

 is a gun that fires t-shirts that have significant knockback.

Trivia

 * This weapon and its high knockback may be a reference to an episode of The Simpsons, in which Maude Flanders is shot by a T-Shirt Cannon and falls to her death.
 * Coincidentally, it makes an appearance in a free title from Devolver called Devolverland Expo in which it is used to stun security drones and activate systems out of reach.