The British Medical Journal has a fun paper -- Parachute use to prevent death and major trauma related to gravitational challenge: systematic review of randomised controlled trials -- raising questions about the use of parachutes because its effectiveness has never been proved using a randomized control trial [Hat tip: Fabio Rojas]. This footnote says it all:
Contributors: GCSS had the original idea. JPP tried to talk him out of it. JPP did the first literature search but GCSS lost it. GCSS drafted the manuscript but JPP deleted all the best jokes. GCSS is the guarantor, and JPP says it serves him right.