A large, elaborately decorated Christmas card. When opened, there is a very loud bang from a small* explosive charge, and a paper hat, gift, and humorous motto/dreadful joke are ejected with reasonable** force.
Most suitable for wealthy elderly relatives with heart conditions, from whom you have expectations of inheritance.
*For a given value of "small". The design specification did include the phrase "low lethality" but current batch testing indicates that not all requirements have been met.
**Consult your professional legal advisor for the exact definition of "Reasonable Force" in your local jurisdiction. BorgCo are not liable for any injury or death, howsoever caused, arising from the use or misuse of our products***
***Particularly the ones clearly labelled "THIS SIDE TOWARDS ENEMY".-- 8th of 7, Dec 14 2019 Ah, it was YOU, was it? Good job it was Sturton who opened it. His reaction time is a little over three minutes, which gave the intercalary the chance to jump in and explain that it was all perfectly harmless, before he realized that there was an it.-- MaxwellBuchanan, Dec 14 2019 We call it "Beta testing" as in "Beta to test it on someone else before trying it yourself"
Was he hurt ? if not, our apologies.-- 8th of 7, Dec 14 2019 random, halfbakery