Detroit Lions fans are a unique bunch.
They unfailingly support a team that seems to do little other than failing. It's one thing to support a team like the Patriots, Packers, Steelers, Ravens, etc. Those are hardcore fans who frequently get rewarded for their loyalty.
Lions fans are still waiting for their Super Bowl ship to come in, and they'll continue to wait for as long as necessary because being a Lions fan means having patience.
That said, Lions fans rarely exhibit actual patience. Hope springs eternal in Motown, whether warranted or not, and from that hope springs rage when the team doesn't measure up to expectations—which is more often than not, partially because expectations are usually too high.
By the end of the season, fans "can't do it anymore" and threaten to quit. And then something magical happens that brings all Lions fans together in disagreement and renews faith in the team a few months after all hope was lost, beginning the cycle anew.
That event is at the core of the biggest way you know you're a Lions fan: