Stranger Things [1] might be a sci-fi thriller filled with jump scares and terrifying moments [2], but behind the scenes is a different story [3]. In celebration of Stranger Things [4] Day — which takes place on Nov. 6, aka the day Will Byers (Noah Schnapp) first goes missing — the cast and crew graced us with a season three blooper reel. And it's filled with everything you could hope for: singing [5], dancing, adorable moments, and a lot of on-set mishaps. The stars even have a hard time saying some of their lines without cracking up, especially David Harbour, who thinks the word "grandma" is hilarious. Watch the cast members goof around [6] in the clip above, then read up on all the juicy details we have about season four [7]!