Unclutterer thinks we carry too many keys with us. Sure enough, I have one on my keyring that I can’t even identify, although I think I had it made myself. It may belong to a bicycle I got rid of in 1998.
So, take a moment today to look at your keys even if you think you need them all. Just look at them one by one and ask yourself if you really need them.
What I am wondering about are the keys I don’t carry around with me. Here are the keys I was given when I moved into this flat:

Two are new ones belonging to a proper lock that the office insurance policy wanted me to install, but three are missing because a friend has them, and the one for the back yard is in my handbag. Two are for the cellar and one for the attic, two for the main building doors, one for my letterbox, two for my flat, but I don’t know about the rest.
(Indirectly via zonebattler’s homezone)