Helicopter superstitions and "old wives" tales?

A few weeks ago on my last flight I kept having to put the collective lock
on and scratch my nose on the circuit approach. Could be nerves, but my
instructor noticed and commented "we'll have to get the tail rotor looked at
during the next service." When I queried that odd announcement, I was told
that an itchy nose is often a sign that the tail rotor is out of balance!
(Harmonic resonance I guess.)

Anyone else heard of that before, and are there any other similar odd things
in the heli biz? (Ok, I know the one about it being bad luck to jump whilst
underneath a spinning rotor!!)

Si