Have you chaps tried juggling these things? Juggling being a very boring thing that's inflicted on you by the sort of people who have spent years perfecting an act for which the half-life of interest in spectators will be measured in lonely seconds. So it has to season in a vague attempt to push the interest up into the ten seconds. Hey look, I'm juggling fire! Chainsaws! Temperamental ordnance, rusted canisters of volatile nerve agents, test tubes full of plague!. That kind of thing.
I think super-sharp knives could keep my attention for several seconds.