During the Covid-19 pandemic, meme mania swept through the U.S. stock market, short-squeezing and shuttering high-profile hedge funds. That is nothing compared to what we are witnessing in the agentic AI era. The latest breed is different. They are not struggling video-game or cinema chains—you might remember GameStop Corp. and AMC Entertainment Holdings Inc.—but trillion-dollar companies whose sheer size alone can distort and sink entire equity markets.