K is for ?

(This is Nate) So we're in the car, and Ben's looking at his new cup...the conversation begins:

Ben: "Dad, where did you get this cup?"

Nate: "Dunno, Mom got it."

Ben: "I think she got it at KMart" (I'd be willing to wager Kristen's never been to a Kmart)

Nate: "Um, doubt it buddy"

Ben: "I'm pretty sure she did...It has a 'K'...For KMart...Shop Kmart Smart Dad"

Nate (dying laughing): "Where'd you hear that buddy?"

Ben: "The lightbulb guy on TV told me. We should always shop Kmart Smart Dad."