Boo Party

From BoardGameGeek:

The costume party is in full swing! But MONSTERS are hiding under disguises... Fortunately, the is here to unmask them! What role will you play? As a MONSTER, choose your costume carefully to stay hidden and avoid being caught by the seer! As a SEER, remember which costumes have already been worn to unmask the forgetful monsters! Boo Party is a game full of wacky costumes and hiding thrills! -description from the publisher