On the serious side.... I guess I'm one of those 'weirdos' who cannot/will not load either of my two cameras with film and have to use film holders that are not 'loaded' until I'm 'about' ready to get out the door. By so doing, I am 'aware' of which film and its 'make and speed/sensitivity' in each end every one the loaded film holders... I've 'screwed up' a few times by not following that 'house rule'.. and ended up exposing/processing 'wrongly'.. it can cause Sirius (oops... SERIOUS problems
Ken