You've probably have already seen the video that shows North Koreans weeping hysterically over the death of Kim Jong-il:
I've read almost everything from and outside of North Korea about the sincerity of the criers. I came to conclusion that almost all of them are really crying, which is even more tragic, I believe.
A few of them, though, seem like impostors. They probably over-acting when the camera is around. When I see such people who cry in a suspiciously exaggerated manner, I instantly recall the following video. It is probably shot in an Iranian mosque during a Shiite mourning ceremony and the fake-crier is possibly an Azeri man. Check it out and compare:
