In fact, the father of modern experiments, Benjamin Franklin, became intrigued with static electricity parlor tricks early in his life. You can do them too. The theory of electrification lies within static charge. The junior version of lightning is static.
Lemons contain citric acid.
Attach them to meter. Electrochemical action is forcing electrons to flow from one metal to the other. Break it up, opening your mouth while doing so. Inflate an ordinary balloon. Rub it briskly on your wool sweater.