It seems like a simple premise, but single mom Harmony Smith’s offhand YouTube bio, “I have a son. We laugh at each other a lot,” sums up the rapport she and her son Elliott have built across social media, making quirky joke videos for tens of thousands of followers. Always a showman, @theotherelliottsmith often dances and sings his way into fans’ hearts, usually with nods to songs like Jason Derulo’s “Wiggle” or Michael Jackson’s “PYT” staged in everyday spots like the grocery store, and posted on Vine. With 500M+ loops (and even a Vine-sponsored trip to Spain), the @heyharmony duo are now expanding to more than just Vine, Instagram and YouTube, with Elliott slated to star in Jesse Eisenberg’s forthcoming directorial debut series Bream Gives Me Hiccups.