I keep spare change in my car and today I noticed among the rest of my coins was a 1958-D Wheat penny. I decided to polish the coin for my own amusement (I've never actually cleaned a coin before, being new to the hobby). Strangely enough it was kind of relaxing and I was excited to see a 50 year old penny shine again!
Edited to Add:
Oh, and I got a 2005 Buffalo Westward Journey Nickel in change this evening from one of the express checkout machines at my local supermarket, I had fun cleaning that too!