This friend I made, once, when we were more acquaintances than friends, she and I got lost trying to catch a train and had to wait two hours for the next one. It was something we shared, yeah, but it was more than having similar tastes in music or something of that level since we shared a hardship (not a big one of course) and could understand each other's feelings a little better. That's what I like when I make friends. Serendipity. You can't really cause that to happen. Well, I suppose you can to some extent by setting up situations where you might share a fun experience. But yeah, I'd probably hate a world of superficial connections too.