Adam slouches against the couch because he’s too darn lazy to sit.
That, or he’s just laying back and ready at a moment’s notice to kick into action!
Remember Wacky Packages from the 70’s? They were a series of trading cards (stickers) featuring parodies of North American consumer products. They were produced by Topps Company beginning in 1967. Anyway, this picture of Adam brought to mind one of those stickers:
The tag line reads: “Good for nothin’ couch-potato chips: Guaranteed fresh until your parents throw you out!”