[Joker: Well, do guests get to keep these?] Heh. Sure, you do whatever you want with it. We got a closet full of them.
Who: David Endochrine
Source: Batman: The Dark Knight Returns (2012-13)
Notes: The Joker, annoyed by Dr. Wolpert's claims about Batman, asks character if he can keep the coffee mug. After character complies, the Clown Prince of Crime breaks the mug and slits Dr. Wolpert's throat with its remnants before adding, "So long as you won't miss it." Immediately after that, two Joker toxin mannequins crash into the talk show and spray the toxic gas that kills character and everyone in the audience except the Joker, who just smiles unflinched.