"My brother and I, when we went to public school, we even started a little gang back in, like, the fifth grade," he dishes. "It was, like, a classic elementary school gang."
"We were called 'The Force,'" Sprouse adds with a laugh. "It was horrible. Yeah, it was really bad."
So, where are the Sprouse brothers' fellow "Force" members today? "I don't know, man. They disbanded," the 25-year-old actor jokes. "We lost that brotherhood, but we still wear it with us."
Press play on the full episode of Sweetwater Secrets above to find out which Riverdale couple Sprouse is currently "shipping," who in the cast he would trust with a secret and his delicious go-to diner order. (Spoiler alert: Jughead would definitely approve of his answer!)
Riverdale airs Wednesdays at 8 p.m. ET/PT on The CW.
Check back to ETonline immediately after watching "Chapter 16: The Watcher in the Woods" for even more Sweetwater Secrets from KJ Apa and Lili Reinhart. Plus, we're revealing our biggest "Hisses and Kisses" of the episode!
Want more Sweetwater Secrets? Press play on the video below to find out if Camila Mendes is allergic to Apa's cologne!