I kind of just did. Shen has a Facebook Messenger chat for his FB page, where only he can talk. People can reply to his messages with emojis, but that's it. He uses it to update his community on his comic and personal life ordeals.
For some reason, a bunch of people started spamming the bike emoji on every message he posted. He started freaking out about it, asking why people are using that emoji specifically. But no one can respond, so he just got more bike emojis. So it's become a thing, where he occasionally just gets frustrated that the bike emoji is the dominant response to everything he posts.
It started pretty randomly and he fanned the flames by pointing it out. I think people were just enjoying watching him freak out about it - especially since he couldn't get a response to his inquiries without opening his chat to everyone. He seems to be taking it well, though.
I couldn't tell you. It appeared to start randomly on FB Messenger and he just made it worse by pointing it out to his followers. Now he gets hundreds of bike emojis on every comment he posts.