Lush
Mods' Pet
The original question is unfair - your favourite song is almost always a favourite song AT THAT MOMENT.
So while 'Waterloo Sunset', as previously mentioned is a masterpiece and in my revolving top five records which take it in turns to be my favourite, today it's not my favourite. Tomorrow, it might be.
However, here it is for your delectation...
[yt]5J3gX47rHGg[/yt]
I HATE Waterloo Sunset. What a dirge.
Blah blah blah, blah blah. Blah blah blah, blah blah. Blah blah blah paradise.
Ugh.