Leave a comment and I'll:

a) Tell you why I friended you.
b) Associate you with something -- a fandom, song, color, photo, etc.
c) Tell you something I like about you.
d) Tell you a memory I have of you.
e) Ask you something I've wanted to know about you.
f) Tell you my favourite userpic from your list.
g) In return, you need to post this on your

I've seen it around, thought I'd give it a shot. : P

So, post and I'll tell you the reasons why I love you. Then, put it in your own journal and spread the lovin'.