If you didn't personally live through the 1970s, it's easy to make assumptions. You probably picture everyone dressed in bell-bottoms, their shirts unbuttoned down to their navels and their perfectly coiffed shag haircuts not budging as they boogie-woogied all night long. And while some of this may be accurate—especially the bell-bottoms—it's by no means the full picture. Those of us who came of age during the grooviest decade in history have memories that run deeper than Donna Summer and bad fashion, and we also have some serious '70s nostalgia. From School House Rock to Pet Rocks, here are 20 things that only '70s kids remember.