Really Pointless, Bordering on Extremely Pointless

So I felt last night's office had a couple gems in it - especially Michael Scott's rolodex....

"I coded it green. Green means go ahead and shut up about it. Orange is orange you glad you didn't bring it up."

Anyhow.

At one point, Andy performed the Paul Simon classic "You Can Call Me Al" a cappella.

OK, nothing against this song, cause I gotta admit it's got a little bit of a catchy melody, but if you look up the lyrics online as I did....this has GOT to be the most pointless, illogical song ever written (sorry Paul). WHAT is this song about? I can call WHOM Al? And what does anything in any stanza (??) of the song have to do with anything else in the song? I ask this, because, apparently, this is a time honored classic, so there really must be SOMETHING to it. Anyhow. Can ANYONE answer this question?