Booker, already a Twitter celebrity and mega-user with more than 1 million followers, tweeted that he was okay.
Early in the morning, he went back online to let everyone know, again, that he was okay.
But by then, Booker's moment had become a full-blown Internet sensation. With a cue from the Chuck Norris meme - in which the action star is said to be the toughest thing on earth - the meme was born.
The meme made the mayor happy. But he also used the moment to do his civic duty.
By 10 a.m. Friday, two Tumblr blogs were set up to honor the moment.
The meme intersected with other memes, like that of the famed online honey badger video.
And a number of Twitter users made reference to the other big news story today: The failed rocket fired by North Korea.
In fact, every news story imaginable was connected to Booker.
A morning news conference added to the sensation.