Many roller coaster lovers balked at the idea of "no screaming" rules at Japanese theme parks announced earlier in the summer, but the new rule has seemed to catch on. Many theme parks have implemented this rule because of the coronavirus pandemic. Simply put, screaming spreads droplets from your mouth, and droplets spread germs.
Greenland theme park in Arao, Japan, came up with an innovative way to normalize this rule: Stickers guests can put over their face masks to look like they are screaming.
There are several different styles of cartoon mouth stickers guests can choose from on arrival at the park.