Meme stocks have been all the rage so far this year. That's understandable, with several of them delivering triple-digit and even four-digit percentage gains.However, what goes up can come down. Analysts don't expect the online frenzy fueling the ginormous jumps for some of the most popular stocks will be sustainable. Here are three meme stocks that Wall Street thinks will plunge by more than 20% within the next 12 months.AMC EntertainmentAMC Entertainment(NYSE:AMC)ranks as the best-performing meme stock of all. Shares of the movie theater operator have skyrocketed close to 2,500% year to date.The consensus among analysts, though, is that the stock could lose 90% of its current value. Even the most optimistic analyst surveyed by Refinitiv has a price target for AMC that's more than 70% bel