Had to travel Greyhound yesterday, so i looked up a list of prohibited items… Pick your favorite

Prohibited Items for Checked Baggage
Acids, ammunition, animals, combustible liquids, compressed gases, corpses, cremated remains, explosives, firearms of all types, fireworks, flammable liquids, furniture, hazardous materials (poisons, radioactive materials, etc.), materials with a disagreeable odor, matches, merchandise for resale, protruding articles, or any unsecured articles including those in plastic or paper bags are prohibited. Electronic equipment (television, stereos, etc.), film (flammable), and perishable items (food) may be sent using Greyhound PackageXpress with appropriate packing. Items such as money and prescription medication may not be checked as baggage and are to be carried in the customer’s possession
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