You should always have people say "cheese" (or some other word) when you are ready to photograph them.

False

Explanation:

Go for comfort. We've all seen vacation photos where people line up awkwardly by a famous landmark, stand in front of the camera, and say "cheese." You may even have some of these photos yourself. While these photographs are always options, you can also try letting your subjects get comfortable and do something other than stand there. Have them sit on the steps of the museum and talk. Take a picture of them playing tag in the lawn by the lighthouse. Snap a shot while they are looking at something, even if their faces aren't fully turned to the camera.