In the Philadelphia Eagles' run to a title in the 2017 season, Minnesota Vikings fans put a jersey from their team on the Rocky statue at the base of the Philadelphia Art Museum before the NFC Championship Game.
In the playoffs this year, New York Giants and San Francisco 49ers' fans did the same. It obviously didn't work out well for any of those teams, to the point that Eagles center Jason Kelce offered an interesting theory on who was adorning the Rocky statue in opposing jerseys during his New Heights podcast (a Jukes Original presented by Wave Sports and Entertainment) with brother and Kansas City Chiefs tight end Travis Kelce (20:48 mark):
"I'm gonna be honest, I think somebody from Philadelphia is doing this now," Jason Kelce said.