Small Nazi mousegun issued to fast jet pilots and earlier to the Royal Protection Squad until some copper put wrapped his left thumb around & had a stoppage at an inconvenient moment. This is an example of Bad Drills. This was clearly the fault of the gun and not simply Bad Drills, so they reverted back to revolvers, and coppers could then wrap their thumbs around the back with impunity.
In British service chambered in the most powerful option of 380ACP, yet still had the sort of stopping power useful only for tickling chickens at medium range, or maybe popping stray baloons. Despite this rather large flaw, it was James Bond's weapon of choice for many years.