An fat old-fashioned cartooney revolver which, in spite of looking like a heavy caliber firearm, can only propel bullets out a tiny distance before they immediately fall to the floor in an ironically anti-climactic fashion. They quickly blow up and knock the target back a maximum of four tiles, perhaps dealing fire. The charging animation consists of the knight preparing for massive recoil, only for a tiny "bang" flag to come out. However, a slow bomb fuse timer will appear where the cursor was, and upon going off will strike an area of five tiles in diameter with a large anvil from the sky, which deals no knockback but significant damage and perhaps stun status. Neither status is totally necessary. The charge isn't intended to simply be a long range bomb; getting the target under the anvil via the non-charge shots is supposed to be a challenge.
This could all potentially be accompanied by a custard-pie shield which, for each enemy hit in a shield bash, spits out a status puddle like a chromalisk, stunning enemies with thick rich custardey goodness making them ample targets for anvils. Perhaps a rotten fish or rubber chicken could make a nice sword.
SK isn't Looney Toons