@MakersHour You know those games where you have to guide a ring over a twisted length of wire, and if you touch it a buzzer goes off? When I was about 6 I dismantled one and worked out that I could make the buzzer go off, but there were sprung contacts on the battery, and if I put a bit of paper in there it would stop going off. I taped the paper to the door, buzzer to the doorframe. Santa Trap.

Sadly, dad set it off about 2am. I had to get out of bed to show him how to stop it buzzing.