Mr. Men nail polish/Happy Birthday, Mr. Smithers (from The Simpsons)

Cast

 * Walking on Little Miss Sunshine as Mr. Burns
 * Don't Worry, Be Mr. Happy as Mr. Smithers

Lyrics
Don't Worry, Be Mr. Happy: On another topic, the preparations for your birthday have begun.

Walking on Little Miss Sunshine: I won't get what I really want.

Don't Worry, Be Mr. Happy: No one does.

( Don't Worry, Be Mr. Happy has a fantasy of Walking on Little Miss Sunshine naked popping out of a cake)

Walking on Little Miss Sunshine: Happy birthday, Mr. Don't Worry, Be Mr. Happy.

Don't Worry, Be Mr. Happy: Mmmmmmm....