I'd tell everyone, wife, kids, neighbors, telemarketers, everyone... then I'll go on a huge killing spree, terminating everyone I told, 'till only I was alive to rule over my bairn wasteland of human corpses.
But I'd keep it to myself, it's for emergencies right, no point in flashing it around unless you're a Texas nut. Better to keep it concealed, and when needed it'll be there, other people knowing will just create problems. And I wouldn't want my wife to look at me knowing I have a gun stored. I just wouldn't want that.