Been there - done that...
A Canberra pilot once wrote a report after returning from a mission and instead of retracting flaps after landing, jettisoning a weapon onto the taxyway!
He wrote a very thoughtful report saying that he was very experienced on the type and that although he could remember performing this action, he had no explanation for what he did.
A certain Swiss airline - now bust, did have one very good procedure. Instead of repeating the command and performing the action, Boeing style, the PNF (or assisting pilot as he was called) would check minimum or maximum speed for the configuration, call out "speed checked", perform the action and then report back "flaps are 5, or gear is up etc" thus closing the communication / action loop. This had amongst other things, the effect of slowing down manipulations by putting some thinking first.
The thing is, as fortunately has so far happened on this thread, not to condemn the pilot at fault but to look for ways to avoid this type of finger trouble in future.
FC.