I've blogged before about how important it is for a diabetic to have a glucagon emergency kit on hand. Unfortunately, this is a pretty intimidating little contraption, with a big syringe full of liquid, a vial with a powder pill inside, and a very official-looking red case. It's so official-looking, in fact, that I think many people are afraid of using it.
So, first things first:
You can't hurt someone by giving them glucagon.
My old nutritionist said to tell friends and family to always give me the glucagon if I was passed out or unresponsive, even if they didn't know whether it was because I was crashing. Better safe than sorry, especially because hypoglycemia can kill if your blood sugar goes low enough without being treated.
All that being said, here is a rather corny, but extremely educational Rick Steves-style video of how to use a glucagon kit. It is by far the best video I've seen on the subject — much better than this one that I blogged about a while back.