CNBC's Jim Cramer said investors should get out of stocks like GameStop and AMC, both of which saw huge rallies this week triggered by social media."When I see meme stock mania taking over again, led by GameStop and AMC, I need to remind you that this is irrational," he said. "There's no way these stocks should reach such elevated levels on their own."AMC and GameStop soared after "Roaring Kitty," the man who helped bring on 2021's enormous GameStop short squeeze, posted online for the first time in about t ...