There are two variants: one is really about weather, but the rule is absurd or tautologous; the other can be about any other topic, makes some sense, often has sexual connotations, and may feature word play or some real, hidden or twisted wisdom.
[5] TV presenter Hellmuth Henneberg [de] once joked: "I only believe in one rule: 'If it rains in May, April is over!'"
("Wenn es regnet im Mai, ist der April vorbei!
")[6] In February 2017, the Federal Ministry of the Environment (BMU) published 11 "New Farming Rules" on its website and on posters at the start of a campaign to draw attention to problems with conventional agriculture "in a playgul an humorous way".
[7][8] [9] These include sayings such as "If the pig stands on one leg, the pigsty is too small", or "If poison hits the plants, the birds remain silent".