antic

(noun) a ludicrous or grotesque act done for fun and amusement. Synonyms: joke, prank, trick, caper, put-on.

(verb) act as or like a clown. Synonyms: clown, clown around.

(adj) ludicrously odd. Synonyms: fantastic, fantastical, grotesque. Examples: "Hamlet's assumed antic disposition." "Fantastic halloween costumes." "A grotesque reflection in the mirror."