Oh man... don't get me started about cell phones. I'm a pretty relaxed and patient guy but the only 'confrontation' I've ever had in Japan was with a jerk and his cell phone on a shinkansen (bullet train).
The shinkansen is pretty expensive by itself, but I buy a ticket for the 'Green' car, which is like a business class car to get some added privacy and silence. The rule is to only use a cell phone in the area between the cars and turn the ringer off.
Of course, 80% of the people in the world are stupid which means that 80% forget to turn the ringer off. Most will turn it off after it rings and they all seem to ring within the 1st 10 minutes after leaving the station.
Okay, so now I've got a jerk across the aisle who gets about 4 calls and is yelling into the phone for about 10 minutes for each call because he is arrogant as well as stupid.
Something snapped in my head and I before I knew it, I was out of my seat, over to his seat, snatched the phone away from him in the middle of a call and snapped the phone into two pieces and threw them into his lap.
I sat back down as he started grousing about the crazy gaijin (in Japanese) thinking I wouldn't understand him. I'm fluent in Japanese, so I told him to shut up or the crazy gaijin would come over and snap his head off just like the phone.
That was the end of the confrontation. I never heard another phone ring in that car the rest of the trip. The big, scary, rampaging gaijin...

I could never fly again if they allow cell phones on planes. Never.