My "favourite" was when I did my first cross-country solo nav-ex.
Map nicely clipped onto my leg board, I leaned forward to check the map, at the same time unbeknown to me pushing cyclic forward as my body leaned forward to read the map.
Needless to say the speed increase and loss of altitude came as a bit of a shock to the system. As if ones first solo nav was not scary enough....
These days, if I need to refer to a map, I now put collective friction on, pick up the map and hold it in front of me and slightly to the side.
Almost a decade ago now, but still fresh in my memory!