Maybe not strictly electrical, however kind of.

At my wife's old job in the break room they had their paper shredder. Every time someone shredded some papers the micorwave would turn on.

At my old job as the facility guy. I got a call one time that Peggy's phone was not working. It just made a bunch of noises when she dialed. I went to her desk and she had bumped thw switch from tone to pulse.

Another time I got a call from the receptionist that the front doors kept opening on their own. I thought to myself, no big deal, this always happens when someone moves the plants closer to the door. Then when the leaves move the motion detector sees motion and opens the door. However this time that was not the problem. So I look around some more and keep looking. Finally I find that a very, very small spider was on the head of the motion detector. You could not see it unless you looked really hard for it. However since it was on the motion detector every time that it moved it opened the doors.
Scott