A ringing cell phone in a movie theatre is sure proof that the owner of the cell phone is a self-centered jerkwad.
You anti-phone people need to calm down.
I'm not anti-phone, I'm pro-politness.
There is a scene in the Sopranos where Tony walks over to some jackass in a nice restaurant who didn't take his baseball hat off and stares at him menacingly until he removed his hat. Some people are not ready to spend time with other adults.
I have been in movie theaters where talking and laughter and phones ringing and people talking on the phone made it impossible for me to hear what is being said on the screen.