On Thursday night, 49ers coach Kyle Shanahan asked his staff if anyone knew whether or not Christian McCaffrey could throw the football.
Tight ends coach Brian Fleury found a clip of the star running back throwing a 50-yard touchdown pass back in 2018 and sent it to Shanahan.
McCaffrey showed off his arm at practice the next day, and Shanahan was convinced.
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McCaffrey's ability to throw the football was immediately implemented into the 49ers' game plan and came to fruition two days later when he lofted a 34-yard touchdown pass to Brandon Aiyuk in a 31-14 win over the Los Angeles Rams on Sunday.
The play did not disappoint, and NFL players and fans went absolutely bonkers on Twitter.
"What makes it work is Christian's so good running on that play," Shanahan told reporters postgame. "When you got a runner like that, you feel like they're going to come up aggressively, so you just do stuff like that to try and slow them down."
San Francisco traded for McCaffrey two weeks ago because it knew what he was capable of in the ground game. He landed in the Bay 10 days ago and already has made history as a 49er.
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McCaffrey became the first player since 2005 to throw a touchdown pass, rush for a touchdown and have a touchdown reception in the same game. He's the first player in 49ers history to record the touchdown triple crown.
And while the play call itself was incredible, the story of how it came about was equally amazing.