I for one get sick of people talking on cel phones in the rest rooms. Talk about invasion of privacy while one is doing their business.
And as to cameras/cel phones on rides, I recall that there was an incident at Geauga Lake ( when it was Six Flags ) when a cel phone hit a rider in the head on The Villain.
A couple years back during the time before Dominator and while Hypersonic XLC was still around, Volcano was closed for a good while because a cell phone hit a man in the head and caused trauma. Though I don't remember if he died or not...