It seems everyone has a camera/video recorder now, but are you amazed at how videos are capturing everything?

I’ve seen on the news lately how a bus caught fire while going down the road and someone had recorded it right before the fire, a woman getting ready to jump off a bridge, caught on camera before anyone noticed her, a fireball travelling down phone and electric wires caught right before it happened.
How does this happen? Are people just standing or driving around with their video camera’s rolling in the hopes of capturing something of interst?