A giant balloon filled with goop hangs in the backyard air, waiting to drop on whoever loses the final round of a homemade game show called ‘Guess the Mess.’ Two teams — the Trash Talkers and the Trash People — have been trading slime, glitter, and cockroach reveals for the better part of an hour. Everything comes down to one question: does a bowling ball sink or float?
How a backyard game show actually works
The setup is Mark Rober’s backyard, somewhere in what appears to be a warm California evening — crickets audible in the background, string lights overhead, a picnic table designated as the ‘table of unlimited possibilities.’ Rober, hoarse from a day at Disneyland, kicks off year four of Camp CrunchLabs with a guest appearance from YouTube creator Bam, who arrives holding a handmade weather station kit complete with a frog figurine designed to croak before storms. Science Bob, described as the neighbor who invented ‘Guess the Mess,’ arrives in a blazer and proceeds to host with considerable enthusiasm for a game he apparently created that same week.
Round one involves a pendulum bowling ball and a walnut balanced on the head of a stuffed squirrel named Phat Gus. The object is to swing the ball and knock the walnut off using inertia alone. Teams earn ten points for winning a round, but the team with the fewest points at the end is the one standing under the mess. Campers Aidan and Calla round out the two squads — Calla joining Rober’s side, Aidan joining Bam’s — and the competition opens with a squirrel-punching hydraulics mini-game to determine who swings first.
Round two calls back a Velcro experiment from a previous Camp CrunchLabs space episode. A Velcro strip holds bocce balls over a shaving cream pie while one team member sits beneath it. The other member adds balls one at a time. The Velcro eventually gives, but in a twist of game show logistics, it drops after the seated player has already stood up and cleared the chair — a rules debate that Science Bob resolves by awarding the round to the team that was no longer sitting.
The part where a bowling ball refuses to sink
The final round is a straight-up science quiz. Three objects, covered and revealed one at a time. Players buzz in with rubber chicken buzzers and call sink or float within three seconds. Round one goes to a rock. Round two — a box of cockroaches — goes to the side that called float correctly. Round three is the bowling ball. Bam’s team calculates density on the spot, citing 9.2 as the relative density of a bowling ball versus water’s 1 gram per cubic centimeter, and locks in ‘sink.’ Rober’s team calls float. The ball hits the water and bobs — significantly, visibly, unmistakably — on the surface. Bowling balls are hollow enough in their core to displace more water than their weight. The physics works out. The Trash Talkers lose.
Bam and Aidan walk to the other side of the stage and stand beneath the Balloon of Doom. The countdown goes to one. A mass of goop drops. Bam, soaked and still composed, offers a handshake. Rober, dry for once after going 1 for 8 against Bam across all Camp CrunchLabs history, stands in the backyard breeze and takes a moment.
What campers are being asked to build at home this summer
Three at-home challenges go live alongside the episode. First, a Rube Goldberg machine — a chain reaction device built to complete a simple task — but this year’s version must incorporate water somewhere in the sequence. A tipping water bottle, a splash into a pool, anything that introduces liquid into the chain. Second, a slow-motion video, but it must include googly eyes on at least one subject. Cutout paper circles with black dots drawn on them are explicitly approved. Third, a reverse video that incorporates food, designed so the backward playback looks intentional and interesting. All three challenges accept entries through August 8th at CampCrunchLabs.com, with one winner receiving an in-person visit to the CrunchLabs facility — described as including a fireman’s pole, Nerf battles, and a notable quantity of pizza.
Weekly build boxes are also part of the summer structure. Past kits have included an air stream ball game that demonstrates the Coanda effect and a squirt gun with a hidden dial that reverses the spray direction, designed specifically to drench whoever you hand it to for revenge. The boxes are normally monthly; the camp subscription moves them to weekly delivery.
The moment Bam stands under the balloon and waits
Bam pauses at the edge of the stage, glances upward at the balloon, and says ‘got you next time’ before the count reaches one. The goop lands. He does not move.
Back at the picnic table with the crickets going again in the background, that bowling ball is still floating in the tank — dense enough to feel like it should sink, light enough in its hollow core that it never does. The goop is on the grass, the shaving cream is somewhere on the set, and Rober is already calling this the best way to start a summer.
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This article was reported in June 2026.
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