Perverbs - also called Anti-proverbs are humorous parodies or combinations of common proverbs. To have full effect, an anti-proverb must be based on a known proverb. For example, Don’t count your chickens in the bush. 

Standard proverbs are essentially defined phrases, well-known to many people. For example, Honesty is the best policy. When this sequence slightly changed (Beauty is the best policy) it becomes perverbs.