His thirst definitely won't be quenched when you hand him a bottle of water mixed with this instant gelling joke! With this special gel, you can instantly turn a beverage into a totally non-edible sludge. Yes, it's mean to give sludge to a thirsty man, but the laughs you get watching him trying to slurp it down will be priceless. Instantly transform someone's beverage Into totally non-edible sludge Practical jokers love this! Completely non-toxic.