Larry Csonka waves goodbye to the Steelers' perfect season. Douglas DeFelice-USA TODAY Sports

The last undefeated team of the 2020 NFL season lost on Monday, which of course was pleasing to the 1972 Miami Dolphins.

Larry Csonka, a Hall of Famer and former star fullback on the ’72 Dolphins, shared a video of his reaction on social media. Csonka took a puff from a cigar and a drink to celebrate.

Why does he have reason to celebrate? The 1972 Dolphins remain the only team in NFL history to go undefeated. The 2007 Patriots went 16-0 in the regular season and were 18-0 but lost in the Super Bowl. The Steelers gave it a run this year but lost to Washington and are now 11-1.

That means the Dolphins are still the only residents in Perfectville.

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