Cause of wet skimming question?

[The Guy]

I've read that hands and arms into a salt water tank or sump will drive the skimmer nuts and making it wet skim.
I never really had this happen until tonight when I was moving stuff around in my RSM 250 that has the skimmer in the rear sump section and all of a sudden I heard this noise I've not ever heard before,
I opened the top right up and my skimmer was over flowing like crazy.
The only thing I can figure is the oils from my skin caused the problem.
This Deltec skimmer is new to me and I had it dialed in and it was working great until this happened, it seems to have settled down now.
I guess if I'm going to work in the tank I should shut the skimmer off.
Anyone else had this happen?