"...and the last three stanzas of your life will purely suck."

At Making Light, Jim Macdonald ponders the moral lessons that can be learned from the folksongs of the British Isles:

Avoid navigable waterways. Don’t let yourself be talked into going down by the wild rippling water, the wan water, the salt sea shore, the strand, the lowlands low, the Burning Thames, and any area where the grass grows green on the banks of some pool. Cliffs overlooking navigable waterways aren’t safe either.

[...]

Going to sea to avoid marrying your sweetie is an option, but if she hangs herself after your departure (and it’s even money that she’s going to) her Doleful Ghost will arrive on board your ship and the last three stanzas of your life will purely suck.

If you are a young gentleman who had sex it is possible the girl won’t get pregnant. In those rare instances you will either get Saint Cynthia’s Fire or the Great Pox instead. No good will have come of it.

[...]

Professions to be particularly wary of: clerks, salty sailors, serving maids, blacksmiths, highwaymen, gamblers, rank robbers, stonemasons, soldiers, tinkers, and millers. Anyone described as “jolly,” “bold,” or “saucy.” Supernatural creatures are best avoided. If they can’t be avoided, they should be addressed respectfully. If a supernatural creature sets you a task you’re well and truly screwed.