Did you know that some coins are deliberately made with errors? Known as "mules," these rare mint mistakes often involve the combination of mismatched obverse (heads) and reverse (tails) designs from different denominations. A famous example is the 2000 "Sacagawea dollar/Washington quarter" mule. These blunders can skyrocket a coin's value among collectors, turning a small mix-up into a coveted treasure. Have you encountered any unique collectible errors in your own pursuits? Share your stories; I'd love to hear about your rare finds!