I'd suggest "Sample in a Jar". A good friend of mine who always despised Phish actually loves this song. It's a good, no-nonsense (well, minimal nonsense) rock song. It shows that Phish aren't always so "goofy" and "weird". I don't quite have my finger on what kind of music Scott likes, but maybe this will work. I'd suggest playing the studio version. Studio versions, in general, are probably better than the live versions for the purpose of converting a newbie. Good luck!