They said it, not me: Warner's better than Manning

The term "Greatest Show on Turf" was not used to describe the Rams offense until several weeks into the 2000 season. The first appearance of the term came when ESPN's Chris Berman, preparing to cover highlights of a 57-31 win over the San Diego Chargers that year, said to television audiences, "Forget Ringling Brothers; the Rams are the Greatest Show on Earth." Over the following weeks, "Earth" was replaced with "Turf" to signify the Rams' artifical playing surface and how well it served the Rams' already speedy offense. The term was retroactively applied to the 1999 team, as the offensive philosophy and key players were the same.

I've should of known Berman had a role in this