"In rare circumstances, Alexa can mistakenly hear the phrase 'Alexa, laugh,'" a spokesperson said in an email. "We are changing that phrase to be 'Alexa, can you laugh?' which is less likely to have false positives, and we are disabling the short utterance 'Alexa, laugh.' We are also changing Alexa’s response from simply laughter to 'Sure, I can laugh' followed by laughter."
Amazon says the fix has already been rolled out.
This confirms the theory that Alexa was falsely triggered and not possessed. While it's promising the company issued a fix, that probably isn't enough to comfort users who allegedly heard Alexa laughing without a sound or in the middle of the night.
Here are a few examples people managed to capture when they asked Alexa to repeat the last thing she said, just so you can hear just how creepy it is.