Have you left explicit instructions for someone to follow in the event of your death?

Something other than a will. Instructions for a specific act, such as “Deliver this envelope to my son” or “Destroy all my poetry manuscripts” or “Contact this lawyer and tell him they got me.” Or the perennial “Here’s the key to a lockbox. Recover the contents and…” (Where? Where is it? What lockbox?)

If so, how did you choose the person to instruct, and how can you be sure they will carry out your request?

Something like this occurs sometimes in fictional plots and sets the action moving. It always makes me wonder about the person who performs the assigned deed.