What was the first reality show in the '90s

"Smile, you're on Candid Camera!" Thank you, Alan Funt!

Although reality TV’s popularity exploded in the 21st century, the genre is nearly as old as television itself.

The hidden-camera show "Candid Camera," often identified as the first reality TV show, premiered on the ABC network in 1948 with the title Candid Microphone, reflecting the show’s roots as a radio program (various versions of the TV show aired from 1948 to 2014).

Candid Camera surreptitiously filmed unsuspecting people reacting to elaborate practical jokes, such as a telephone booth that levitates during a call and a two-way mirror at a barbershop that surprises customers with startling images.

https://www.britannica.com/topic/reality-TV