Actually,Iron..
I have the Green Day CD "Nimrod" from which that song comes from! :D
I happen to really love that song and seeing as how I'm not that big on the band itself,that really says a lot.
There was no single to buy so I had to get the CD. I like the song mostly,because "A":I love well done acoustic songs & "B": It kind of reminds me of the much more depressing,"Dust In The Wind" by Kansas. (Thankfully "Time" is more pleasant.
Don't worry,the theme from MASH will exit soon enough. One of the best ways is to play other songs that are far more catchy. ..but no matter what you do,a song will get stuck in your head. :D