what is your favorite beatles song and why

mother mary comes to me... you know, the lady at the deli? anyway, it is hard to pick just one... so in addition to 'i am the walrus' id like to add:

money
yellow submarine
think for yourself
taxman
dr robert
while my guitar gently weeps
im so tired
happiness is a warm gun
lucy in the sky
dig a pony
one after 909