This discussion may contain spoilers!
THIS IS YOUR SPOILER ALERT!!
If you unlock the Sam & Max 25th Anniversary Set, Brock, Claptrap, Ash, GlaDOS, and Reggie sing a song as one of their location-exclusive conversations. What is the song a reference to? I know it has something to do with "Hit the Road," but it was the slow melody that's bugging the hell out of me!