AMC Entertainment (NYSE:AMC) stock rose 20% over the weekend as “meme stock trading” came back.The action began in GameStop (NYSE:GME). It rose 80% after Keith Gill, who calls himself Roaring Kitty, bought $116 million in shares. He also bought call options (aka bets a stock will rise).  AMC stock opened this morning at $5.55 per share, its market capitalization rising to $1.6 billion.Care to Play?Meme stock trading, like skateboarding, is fun until someone gets hurt. People who lead others into trades ofte ...