The below description is taken from LEGO.com.
Everything in life is a joke to the mirthful, merry and mischievous Circus Clown. Whenever things get too dull, up he pops with a banana cream pie to toss, a bottle of seltzer to spray, or a honk of his horn to brighten your day. You can always count on him to appear with a funny gag at just the right moment to lighten the mood.
The Circus Clown is a master of physical comedy, and it's a good thing, too - aside from a honk of his horn or his big red nose, he never makes a sound, even when doubled-over with laughter at his own silly antics!