Can bestfriends fall in love?

I do honestly believe that two bestfriends of the opposite sex can fall in love.  I think that when two a boy and a girl are bestfriends that sometimes they don't even realize that they love eachother.  They don't realize it becase they just have so much fun with eachother that they sorta just let it pass over their shoulders. If they do realize it, i think that one of them should make a move to try and ask the other person out or whatever.  If they have somebody else in their life that they might like, and if you dont make a move, you might go through life wondering what couldve been.  By this I mean that yous loved eachother, but yous never tried it out.  In my opinion if you have a bestfriend of the opposite sex and you like them, you should totally take the chance and ask them out or something.  If you dont, you might loose them forever.