It's hard to believe that it's been 20 years since our favorite stoner comedy show premiered on TV. While we'll always have reruns and memories of epic times in Forman's basement, the cast of That '70s Show is reminiscing on those incredible eight seasons. On Thursday, Laura Prepon, Topher Grace, Wilmer Valderrama, and Danny Masterson each posted sweet notes about the impact of the show. (We're just going to assume the social-media-less Mila Kunis and husband Ashton Kutcher celebrated the anniversary by re-creating their life-changing first kiss.) Read on to see the cast's nostalgic posts, and then bask in some of our favorite memories from eight glorious seasons of That '70s Show. Hello, Wisconsinnn!