Post Hoc Ergo Propter Hoc
"After this, therefore because of this". Assuming that because B followed A, A must have caused B.
Examples
- I wore my lucky socks and we won the game, so my socks caused our victory.
- I took this herbal supplement and my cold went away after three days, so the supplement cured my cold.
- The stock market crashed a week after the new regulations were announced, proving that the regulations damaged the economy.