Laughter

What is laughter?
Check this "awesome" link and make a comment for me.
http://en.wikipedia.org/wiki/Laughter

I really used to laugh alot, I mean from pretty much everything. Actually even got myself into a trouble when my boss thought that i'm doping(which I didn't). Had to prove him with an test. Pissing infront of an old lady, priceless.
However, I find myself hard to laugh these days, I don't know. Don't get me wrong, i'm still quite happy chap but I miss the feeling of real laughter, you know when you can't even stop it? I miss that. I feel broken.
Is internet causing this? Should I have more friends? I find myself mostly giggling instead of 'laughing'n'crying'.

Maybe I should try to enjoy things more.