Jordan tries to make his own paintball gun but ends up inhaling the paintball. He is seen vomiting, and Bernie says something to the effect of, "You're lucky you didn't have to get your stomach pumped." Paintballs are made of edible materials - the outside is made of a sugar base and the inside is basically like food coloring and water. They would not make a person vomit and they certainly would not need their stomach pumped. The worse that would happen would be that they would probably taste horrible.