"Is it feed a cold, starve a fever, or the other way around, I can never remember?"
Does it matter if you get the rhyme wrong? A folk remedy that doesn't work doesn't work whether or not you say it right.
Zig Ziglar used to tell a story about a baseball team on a losing streak. On the road for a doubleheader, the team visited a town that was home to a famous faith healer. While the guys were warming up, the manager disappeared. He came back an hour later with a big handful of bats. "Guys, these bats were blessed and healed by the guru. Our problems are over." More...