Friends costars are not the only celebs finding nostalgic ways to promote safety guidelines to their fans. Patrick Dempsey recently to convince fans to wear their masks, while posted a very clever meme in June. If all that doesn't work, let's hope Harley and Hopper convince more people to do the right thing.Authentic, Accessible, RelevantMore from GlamourSee More Stories© 2020 Condé Nast.