A friend at church is a retired locksmith. He got rid of most of his locks, keys and tools a few years ago. However, today he gave me a few keys he still had. Very nice of him!
One time clock key, 4 master key blanks, and a novelty plastic key:

The novelty key is a knifeThe large key on the chain is for the lock in this picture:

I'll be tossing the time clock key in my unusual or cool keys collection.
Gordon
Just when you finally think you have learned it all, that is when you learn that you don't know anything yet.