A version of this story first appeared in CNN Business’ Before the Bell newsletter. Not a subscriber? You can sign up right here.What’s happening: Shares of AMC Entertainment (AMC) have shot up nearly 120% this week as amateur investors show renewed enthusiasm for the movie theater chain. They climbed 36% on Thursday alone, reaching their highest level since 2017, and are up another 12% in premarket trading Friday.So what’s happening, and should Wall Street be bracing itself for another GameStop-like