“Batman: The Last Laugh (#1.15)” (1992)
Alfred Pennyworth: Rough night of crimefighting, sir?

Alfred Pennyworth: Well, you’ll be happy to know I’ve drawn you a bath. Whenever you’re ready, sir.
[Bruce approaches the tub, which is empty]
Bruce Wayne: What’s the deal, Alfred?
[Alfred holds up a small card, with a picture of a tub on it]
Alfred Pennyworth: I said I “drew you a bath,” sir. April Fools!
Bruce Wayne: Very funny, Alfred. I guess I’ll just take a shower.
Alfred Pennyworth: [to himself] Not a funnybone in his entire body.