Ever wonder where the word SHIT comes from?
Well here it is:
Certain types of manure used to be transported
(as everything was years ago) by ship.
In dry form it weighed a lot less than when wet, but once water
(at sea) hit it, it not only became heavier, but the process of
fermentation began again, of which a by-product is methane gas.
As the stuff was stored below decks in bundles you can see what could (and did) happen.
Methane began to build up
below decks and the first time
someone came below at night with a lantern, BOOOOM!
Several ships were destroyed in this manner before it was discovered what was happening.
After that, the bundles of manure were always stamped with
the term
"S.H.I.T" on them (which meant to the sailors) to "Ship High In Transit."