It's game day in Philadelphia, and while the Eagles are going through their final preparations for Sunday evening's NFC Championship Game against the Minnesota Vikings, the city is doing the same.

According to a number of reporters, work crews were out Sunday morning greasing light poles with Crisco.

Crews were out early Sunday greasing light poles on Market Street to discourage @Eagles fans from climbing them during the NFC game celebration. The crews slicked Crisco on the poles. pic.twitter.com/uPT34cEzpt — Melanie Burney (@MLBURNEY) January 21, 2018

Good morning from Philly where crews from the city are greasing the light poles with Crisco to prevent #Eagles fans from climbing after the #NFCChampionshipGame tonight. #Vikings pregame coverage starts at 3 on FOX9. They call themselves the #CriscoCops pic.twitter.com/w1ZkYWZhYG — FOX 9 Sports (@Fox9Sports) January 21, 2018

On Broad Street crews are already greasing down the poles in preparation for a wild night! 😂 Hopefully it’s in celebration! @NBCPhiladelphia @Eagles #FlyEaglesFly pic.twitter.com/27xgjB3BY0 — Aundrea Cline-Thomas (@AClineThomas) January 21, 2018

The reason? The city doesn't want jubilant fans (or anyone, really) climbing up the light poles after the game. It is a safety hazard, obviously.

Of course, Philadelphians have some prior experience with this situation. The South Ninth Street Italian Market Festival has a tradition where people climb a grease pole. You can read more about that from Philly.com here.

The Eagles and Vikings kick off at 6:40 p.m.

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--@danieljtgallen