Grumpus and Shivers react to a scary video of SIREN HEAD, CARTOON DOG and More In REAL LIFE! See more: @Grumpus Reacts & @Meatball Subscribe for more SIREN HEAD, CARTOON DOG And More In REAL LIFE videos! In today's scary reaction video, Grumpus and Shivers react to a terrifying compilation of SIREN HEAD, CARTOON DOG And More In REAL LIFE! In this episode, we show some of the scariest videos on the internet showing the creepiest monsters from Trevor Henderson. In these unbelievable caught on camera videos we show Siren Head, Cartoon Dog, Cartoon Cat, Longhorse, and more monsters! Watch to the end of these scary videos and let us know which monster from our SIREN HEAD, CARTOON DOG And More In REAL LIFE episode was your favorite! Videos we have watched recently: @Infinite - CARTOON DOG Was SPOTTED In My HOUSE! (HELP) youtube.com/watch?v=XaWhXjUwcKo @Jamesify - Finding SECRET SIREN HEADS In GTA 5 (Terrifying) youtube.com/watch?v=zKERBGtmSeA @BriannaPlayz - I...