On Monday night, Elon Musk tweeted an explicit encouragement to his 121 million followers to look into the QAnon conspiracy movement.

“Follow [rabbit emoji],” Musk tweeted. Seemingly innocuous, “follow the white rabbit” is a line taken from Lewis Carroll’s book Alice’s Adventures in Wonderland that has since made multiple appearances in pop culture, most notably in the original Matrix film.

But since 2018, the saying has become synonymous with QAnon and when pushers of the conspiracy urge others to look into the movement. The term “white rabbits” was mentioned on three different occasions in Q drops, twice in 2018 and once in 2019. This gave the term even more importance to the community, which believes Trump is waging a secret war against the deep state.

Within minutes of Musk’s tweet, QAnon communities on message boards, Telegram channels, on Trump’s Truth Social platform, and on Twitter itself, lit up with excitement, believing that the world’s richest man was sending them a direct message.

While Musk has dismissed the claims that he is promoting QAnon, experts worry that the explicit signals he is giving the QAnon community by referencing the white rabbit will embolden them even further, and possibly cause violence. And over the last few weeks, Musk hasn’t done much to dissuade QAnon believers: Twitter has reinstated a host of major QAnon accounts onto the platform.

“[Musk] is on pace to start posting Q drops to millions of normies and there's nothing anyone can do to stop him,” one QAnon influencer wrote on Telegram.