'Stranger Things' Star Gaten Matarazzo is Very Anti-Spoilers for Season 2

One of the kids on "Stranger Things" has been so well trained on not giving away spoilers for the new season ... he sounds like a dad telling his kids no dessert before dinner.

We got Gaten Matarazzo, who plays Dustin, and asked if he had just one little juicy tidbit he could share before Season 2 drops in a couple of days.

Besides him saying "It's gonna be good," Gaten hilariously insists on keeping a lid on things -- but he was happy to tell us about the new pressure on the whole cast, now that Season 1 "raised the bar" so high. He also opened up about his favorite stuff from the '80s ... and it's pretty funny.