Smile, you are on Candid Camera.
The " candid camera " shows Stretton, in several instances, talking one-on-one with the young candidates.
Debuting in 1948, Alan Funt's Candid Camera certainly made its contribution to the genre.
Reality TV actually started on the radio with Candid Camera precursor Candid Microphone in 1947.
A kind of horrific candid camera is the theme of Scare Tactics with host Tracy Morgan pulling elaborate scary hoaxes over on people.