Sometimes it’s fun to take video of people when they think they’re posing for a still photograph. If you’re holding a camera and tell someone to “say cheese” they generally will. Everyone wants to look good in pictures. Most folks will continue saying cheese until you lower the camera ( or phone ) and say something like “got it” or “I think that was the one…”
Try it out for yourself!
Also blinking. Certain people are notorious for having their eyes closed in photos, and those people will usually just blink up a regular lather if you make them pause the pose. If you listen closely to this video, you can actually hear my sister’s huge brown eyes blinking.