Unfortunately, the keypad on the garage isn't a great stopper to entry since my garage has two windows. So, to give ample warning there, I affixed a warning sticker. It has a silhouette of a gun and says "This home protected by 2nd Amendment Securities". It resembles those blue "Brinks Home Security" signs you always see.
Unfortunately it took a long time for me to get my wife to stop leaving her keys in the front door.
That was aggrevating.