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Anonymous
Alligators, crocodiles, fire in some cases, things to choke on, bears, certain snakes, piranahs, nails and staples if you step on them, poisonous bugs... etc. :)
Wiki User
Oregon Driver's Manual says it's dangerous, but doesn't say anything about it being illegal (the recently instituted cell phone law is just above this part, so I trust that it's the most current Manual)