Quote Originally Posted by tim k View Post
I read somewhere to have the group all close their eyes. Then on the count of three or whatever have them open them. That way you have a fighting chance of having all their eyes open at the same time.
Another trick that works if you are using flash - ask the group to tell you if any of them see a red flash when the photo is taken. For most people, this means that the shot caught them in mid-blink.