Clown

The Clown is a rare enemy that sometimes appears during Blood Moons The smiley bomb it throws will destroy nearby blocks when it goes off, like a normal Bomb; this makes the Clowns a serious hazard to any structures. Ranged weapons are the most useful form of attack against clowns. You can use them to shoot the clown's bombs out of the air as well. Once you have defeated at least one Clown the Clothier will start selling the clown costume.

Trivia
Clown clothing colors resembles outfit of Joker from Batman and its smiley bombs resemble the grinning pupkin bombs thrown by the Green Goblin from Spiderman.