Just heard about this: Comedian Stephen Colbert mentioned Up and WALL-E on Monday's episode of The Colbert Report, listing Up as a "bright spot" among his list of "Movies That Are Destroying America —Summer Movie Edition".
He joked that Up's story —an elderly man floating away using balloons— "presents a fantastic solution to [America's] Social Security problem". Colbert went on to jest about the perception that Up does not present a good merchandising opportunity, quipping, "What kid wouldn't want to play with a 78-year-old man action figure? You can make him do all sorts of fun things. Like sitting..."
The complete clip is available on the web at Comedy Central (U.S.) and the Comedy Network (Canada). The Up/WALL-E sketch can be found at minute 2:50 of the clip (clip 2 of 4 if watching the full episode).