I've never even heard of this before, let alone had it happen.
I did use one of those military type wrist straps when I first heard about this, then I came round to the 'what's the chance of that happening' stage.
Depending on fit/setup, next time you land, pause with the collective fully down and note transponder and/or TCAS indications. They probably still say ALT and Normal/UNR/ABV/LW depending on type. Without doing anything, those indications will remain. Now lock the collective and within around 5 secs the indications will change to GND, STBY and/or something else.
You can sit for hours without making the contact waiting for the status to change, just incase you think its some other system at play.
Watch straps, contacting the locking nipple at the top of the collective and earthing through the body, as I said, certainly wakes you up after the umpteenth orbit of a dimly lit church in the middle of nowhere at sparrows fart!