May 21, 2015 8:28 AM EDT

In his final episode of the Late Show on Wednesday night, David Letterman featured a blast from the past.

The clip below shows a much-younger Letterman take a stab at running a Taco Bell drive-thru, with hilarious results. None of the frustrated customers seemed to recognize Letterman’s voice, though one woman thought he sounded strangely familiar, asking, “Are you Howard Stern?”

The clip was a bittersweet reminder of what we’ll be missing out on as Letterman brings his 33 year late-night career to a close.

Watch it below.

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