You haven't made it until E-40 composes a song for you. Those are the unwritten rules.
The Bay Area native rapper recently released a song dedicated to the undefeated 49ers' streak titled "Niner Gang," and it's very catchy.
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To start things off, you hear "Bang bang Niner gang," a few times over, then the love for the team shines through.
Not only does the song highlight the history of the 49ers, but gives major props to "the liveliest fans in the NFL."
"I tried to told 'em we back & we never left and we got a heart, Levi's Stadium starting to feel like Candlestick Park ... "
San Francisco 49ers
The 49ers' Instagram account commented along with NFL veteran running back Reggie Bush -- both in favor of it.
[RELATED: How E-40 would be as GM for Warriors]
Yes, we have it stuck in our heads, too.
E-40 also came out with a Warriors' version of his "Choices" song when the Warriors were -- well, a phenomenal team. It's quite the jam also.
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