If you want to throw people off guard, then you would do well to bring this $14.99 Battery Thermokruzhkus Mug to the office. Yes, it sports a name that is nigh unpronounceable save for the geekiest of the lot, making it difficult for people to borrow your mug from you unless they pronounce it properly, intonations and all. Capable of holding up to 10 ounces of your favorite beverage, be it hot or cold, it is meant to work better with the former. After all, the battery that is imprinted on the outside of the Battery Thermokruzhkus Mug will “light up” whenever hot liquid is poured inside.
Whoever said that caffeine is not its own power source? They must be sorely mistaken then, as anything hotter than 96.8F (36C) will be able to let the green cells within the battery light up. With the passage of time, your beverage will cool down, and the battery then fade into emptiness.