Re: just had one today....
I have endless problems with undergrads here not having any comprehension of how to put batteries in equipment. I have one of those shaped-block-in-shaped-hole toys for infants on my desk now to drag out for them to do some practice on in front of their friends when I find batteries forced in the wrong way (including the contoured insert-one-way-only prismatic camera ones!).
Biting the hand that feeds IT
