Electro Shock Pen
One of the oldest jokes in the book but still one of the best! Let your friends and family borrow this pen and watch their face as they get a harmless electric shock when they press the top just before writing! The only down side is that I can see delivery drivers and postman all over the country reaching for the buy button so they can zap unsuspecting people signing for parcels first thing in the morning! Takes 1 AAA battery which is included.
