In this case it was allen Funt, the friendly/smarmy host of TV's CANDID CAMERA. Originally on radio (as CANDID MICROPHONE) and seen as a series of short subjects in theaters, Funt was an early proponent of the entertainment value of what we now call "punking." He'd set up a situation and then voyeuristically record and comment on how various ordinary people reacted to it. In this case, the ordinary person was Clark Kent who, luckily, was able to pull a switch on the sneaky host.
Funt would later produce the feature film, WHAT DO YOU SAY TO A NAKED LADY?. Scandalous in 1970 (with a great theme song that actually got radio play), it's now a quaint document of how folks reacted to suddenly seeing an attractive young miss in her birthday suit in elevators, parks, hallways, etc.