Homer: Eh, what do you mean by `suggested donation'?
Clerk: Pay any amount you wish, sir.
Homer: And uh, what if I wish to pay ... zero?
Clerk: That is up to you.
Homer: Ooh, so it's up to me, is it?
Homer: I see. And you think that people are going to pay
you $4.50 even though they don't have to?
Just out of the goodness of their... [laughs]
Well, anything you say! Good luck, lady, you're gonna need it!
-- Homer sees the sign `Suggested donation: $4.50' at
the museum entrance, "Lisa's Substitute"