Married... with Children, Season 6

Kelly and Bud sneak into Al's workplace to spy on his "shoe groupie". Kelly motions to hide behind the cash register

Bud:
Hide here? What are we going to do when Dad makes a sale?

Kelly motions to cash register, which is coated with cobwebs

Bud:
Oh. It's Dad, get down!

Al enters workplace

Al{talking to himself}:
Open for business!

Al's optimism sharply decreases when he sees no customers. Al stares into space then buries his face in his hands. A few hours later Al still has his depressed pose

Bud:
Quite an advertisement for college, eh, Kel?

Kelly:
Huh? What are you talking about?