Master of wit and repartee
Two brothers. One's a dullard (slow or stupid person), the other is a master of quick wit and ready repartee.
Dullard goes to the circus one night. The clowns come on asking for a member of the audience to assist. Dullard bro puts up his hand and gets picked.
CLOWN: I say, I say, I say, are you the front end of an ass?
DULLARD: Durrr No!