system
A chat on subreddit /r/wallstreetbets
human
Crypto does it all the time. Technical glitch my ass.  'Flash crash' its called, done to clear out the calls on small margin
gpt
In crypto it also commonly doubles as a 'market signal' between colluding traders. Spike vs. drop shows direction of future direction in a specific coin. Unlikely to be the case here, but still.