Justin Bieber stops by the set to show off some of his Canadian pride, learn about Humanimals and what Popcorning is really all about.

Floyd Mayweather visits the Ridiculousness studio where Rob shows him what a Pain Face looks like. They'll also endure some Romantic Injuries and learn How Not To Train.

Former "PMOY", Sara Jean Underwood, visits the Ridiculousness set where Rob shows off his Fear Face and they talk about how Cats are Weird.

Quinton Rampage Jackson MMA fighter Quinton "Rampage" Jackson helps the crew break down outrageous viral videos.

Chef Duff Goldman brings a scorpion cake; "Unnecessary Costumes","Grand Entrances" and "Ghost Holes"

Australian-born actor and radio personality, Jason Ellis, shows us he is an expert at Showing Off Gone Wrong when the introduction of Tramp Stamp videos earns him a surprise payback from Chanel.

Rob and co-hosts, Chanel and Sterling, breakdown the fun of Redneck Good Times and introduce new categories: Random Tackles, Animal Revenge, Dropping Loads, and many more.

Rob dedicates Whisky Throttle and Bear Trap videos to Nitro Circus stunt man, Streetbike Tommy. Tommy also tells us why you should always Bring Your Own Chair.

Watch an all new season of Ridiculousness Thursdays at 10p/9c on MTV. Lil Jon and Rob enjoy the "Yeah" category inspired by the rapper, watch videos of Dancing Animals, unintentional Body Shots, and people getting Fenced.

Actress and musical artist, Kat Graham, shows us some of her big moments of One Liners and how to dance on stage with one shoe. Rob also shows videos of her Magical Spells.

Rob shows the audience how to Escape Your Pain while friend and pro championship skater, Chris Cole, learns what it's like to be in the Hot Seat.

Rob's cousin and Fantasy Factory co-star, Scott Pfaff (AKA Big Cat), comes to the studio so he and Rob can demonstrate why Birds Are Dicks and how to Get Froggy.

Guest stars WWE Twin Divas, Nicole and Brianna, stop by the Ridiculousness set to show us some of their Backyard Wrestling moves and how to make the perfect Pain Angel.

Rob, Chanel, and Sterling "Stee-lo Brim" educates the audience on how to Save Your Drink, why Safety Hurts sometimes, and sees some "Chanel's In Training"

BMX rider and MTV host, TJ Lavin, stops by to learn about Flinstoning, Shirtless Manplay, and Animal Prodigies.

Rob's parents, Patty and Gene, come by set to watch videos revisiting their children's Pranks, Sibling Rivalry, and some of Rob's best childhood moments.

Watch an all new season of Ridiculousness Thursdays at 10p/9c on MTV. Rob shows video clips to Jackass veterans Wee Man and Preston of imitators trying to re-create Human Bowling and Wackass pranks.