Mixing ammonium and Clorox (bleach) is highly dangerous due to the production of toxic gases, particularly hydrazine, which is both flammable and harmful. Clorox, a brand synonymous with bleach, contains calcium hypochlorite, which reacts with ammonia or amines found in urine, potentially releasing harmful gases. This reaction can be exothermic, raising concerns about the risk of vaporizing hydrazine. The chemistry involved includes various nitrogenous wastes in urine, leading to complex reactions with hypochlorite as an oxidizing agent. The discussion highlights the risks associated with this mixture, including its use as a dangerous prank among janitorial staff, emphasizing the importance of understanding chemical interactions to prevent hazardous situations.