Smaller bum?

"I wish I had a smaller bum," my wife grumbled. "Do you wish I had a smaller bum?"

"Not at all," I told her.

"Aww, you're sweet," she gushed. "Is it because you love my bum the way it is?"

"Not really," I replied.

Spoiler:

"It's because it'd look ridiculous with legs that size attached to it."