Larry wrote:

To turn the breaker off requires a finger to push on one side of the
breaker toggle handle. Coat that side with greasepencil lightly so it's
not very evident. Make the coat smooth so we can see that fingerprint of
the SOB that's flipping the breaker on you. That will let use at least see
"SOMEONE" is flipping it off.

Office supply places also have a permanent staining red ink that won't wash
off. It's available in non-drying printer's ink like they put on a press
with a roller. It takes months to "dry". You could coat the toggle with
that then casually watch marina people's fingers for the indelible red
stain....

Larry, you are a devious son-of-a-bitch! :-)

Cheers
Martin