Serious Cannon

 is a gun that fires large, bouncing cannonballs that pierce through enemies. The cannonballs can bounce up to 6 times before disappearing. Each shot can hit the same enemy multiple times.

Synergies

 * If the player also has Corsair, each Corsair shot will periodically fire two bouncing cannonballs perpendicular to itself as it travels.
 * If the player has Devolver, alongside the cannonball, Serious Cannon fires a screaming Beheaded Kamikaze who chases enemies and explodes on contact. Serious Cannon's shots will also devolve enemies.
 * If the player has Pig, it turns green and fires flaming bats.

Trivia

 * If the player has Turkey, it causes an unknown effect.
 * If the player has Rolling Eye, it causes an unknown effect.
 * This gun is a reference to a weapon of the same name from Serious Sam.
 * The synergy is a reference to Serious Sam: Kamikaze Attack!, another game published by Devolver Digital.