I was tasked one Christmas lunch to booby trap the Mess Pres of a certain Joint Services Officers' Mess with the foil-wrapped contents of an F77 'puffer det' taped to the underside of his place at the table. As he rose to speak, I initiated the charge whereupon he disappeared in a cloud of white smoke.
He must have briefed his relief because the following year, the new Mess Pres invited the Guest of Honour to sit in his place instead.