MYSTERY BOX SLIME SWITCH-UP CHALLENGE!!!

We are doing the Mystery Box challenge with SLIME ingredients... Who do you think will make a better slime?!? We are keeping or switching ingredients from mystery boxes and Ronald really needs Activator!!! Let's see if he and Karina can make an awesome slime...

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Welcome 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!!!