Many indiginous tribes engage in the practice of geophagy. This
involves eating quantities of dirt before any other foodstuffs. In the
native peoples, this dirt serves as a coating of the stomach, so that
more volatile foods that would normally be noxious might be injested.
Don't do this ! It's all very nice to want to be one of the
crowd, but you are not resistant to the microorganisms in that dirt, and
will probably get quite ill.
In summary: Stick to those Jolly Ranchers you put in your back
pocket for the airplane.
Don't.
Several species of monkeys, howler monkeys in particular, have the
rather nasty habit of urinating on over-curious biologists. (but just
biologists, mind. Everyone else seems to get away without a problem).
Therefore, carry umbrellas when observing these primates.
Contrary to popular belief, there really does exist a species of plants
that can walk. The don't go very fast, though, so you should be able to
out-run them should they decide you look more full of nutrients than the
mineral-starved ground they are currently rooted in.
A random link to try to mess things up.