OMG!!!!! SOUREST DRINK IN THE WORLD CHALLENGE!!!! We blended sour candy like Warheads & Toxic Waste into a smoothie!!! It was PAINFUL!!!\rbr\rbrGET OUR NEW MERCH HERE: \rbrSubscribe for more cool videos! \rbr\rbrWelcome to SIS vs BRO! This is where Karina and Ronald join forces to challenge each other in countless fun videos! Challenges, gaming, and more!!! Be sure to SUBSCRIBE and we will see you in the next video!!!\rbr\rbrKarinas Instagram: gamergirlkarina\rbrRonalds Instagram: ronaldyoutuber\rbr\rbrWe LOVE you guys!!!