Why do people break their iPhones so easily?

I have the 3gs, and I've had it for almost a year, and I know people with iPhones that they crack in no time. I have a friend that got the 5 for her birthday like 3 weeks ago, and the screen in already cracked… How does that happen? I'm not even that careful with my phone and I drop it all the time and it has a couple scratches on the screen protector but other than that, I don't really protect it. How do people break their phones so easily?

Actually iphones screen are kinda weak

You have the 3GS so obviously yours won't break because its sturdy and a thick phone.nowadays people concerntrate more on how thin and light the phone is.a lot of people make phones with a THIN sheet of glass and I mean THIN like the iPhone 4 and 4s. The back panel is all glass so it's So easy to break but I can't understand why your friend has cracked an iPhone 5 because that's really sturdy too!

People are just careless, they walk on the sidewalk talking and drop it on cement, etc.

I wish I knew. I've heard all sorts of horror stories with them, not limited to iPhones for the record. Through the 3 iPhones I've owned I dropped them 2 times & only got a slight chip on the bottom of my 1st one.

Guess its how & where.