sometimes just find a nook or cranny to place something really reallllly important that you'll deffffinetly absoluuutly need months later when youve long forgotten where it has gone. dont remember. thats what makes it fun.
When I shared a house with some friends, we came across some LOTR action figures and hid them in random spots in the house. My favorite one was when I positioned Saruman in a defensive position in front of all the condiments that I shoved at the back of the fridge.
