Craig Jackson's Watch

Origin
Though there have been several hoaxes throughout the years the original was organized by UC Santa Cruz student Craig Jackson. Jackson started up on-campus warnings and postings on campus including going to the press to inform the citizens that the gas had been found in the city's water pipes. Jackson's notices included information such as "Dihydrogen monoxide is also known as hydroxyl acid and is a major component of acid rain. Contributes to the erosion of our natural landscape.  Accelerates corrosion and rusting of metals and also has been found in excised tumors of terminal cancer patients.  Despite the danger it is often used in nuclear power plants, in the production of Styrofoam and as an additive in certain junk foods." In the end the truth came out when Jackson presented his findings and people's reactions to his Psychology Professor and earned an A. Due to the sheer amount of people believing in his hoax and the imagination of Jackson the watch became imbued with the fake gas.

Effects
Emits 'Dihydrogen Monoxide' which is a nonexistent gas. If this gas is inhaled blisters break out on person.