Honest officer, the gun went off all by itself!

Cover illustration from Le Petit Journal (29 March 1914) depicting the assassination of Calmette by Madame Caillaux.

I started reading Dead Wake: The Last Crossing of the Lusitania by Erik Larson and almost immediately ran into this passage:

Henriette Caillaux, pistolet

Henriette was one of the richest women in France at the time. Wikipedia has an account of this incident.