Scooby Snacks are the small bits of Cannabis that can sometimes be inhaled into the mouth if some of the Cannabis in the bowl being smoked falls past the screen. These are generally harmless, but an annoyance to many bud smokers. One probably won't get high from swallowing these, as the THC found in the Cannabis needs to be freebased by something like butter before its effects can be achieved orally. To avoid Scooby Snacks, find a better bowl, replace your screen, or use different weed that does not contain small particles.