Believe it or not i've shoved a few up in my time, Infact I caused quite a stir at work when I wrote in our communication book that staff had been inserting them the wrong way up and in future could they please ensure that they insert the other way.. this even led to someone phoning the local surgery to ask a doctors advice.
Bear in mind that we are all trained, so they should have known I was joking, who says the NHS employs idiots..?