I got to use the offensive joke! We house- and dog-sat again this weekend, and Melanie decided MollyTheDog made the house smell bad. I found some air freshener and Mel, copying the Glade commercial, asked, "Do you know what's worse than your house smelling like a dog?" The answer she was looking for was, "You house smelling like a dog and flowers," but the answer she got was, "the holocaust". Ha! Ha!
She didn't know what I meant, though, which stripped the joke of most of its power.