Uncomfortable

So for one of my classes, we went on a field trip to a nursing home and cleaned everyone's teeth and dentures (gross, by the way) for free. It all went great until the very end. We went to the alzheimer's building and finished them up last. Right as I was about to open up her mouth and look in (I was really close to her face) she roared at me! Seriously, like a lion. Then she proceeded to cackle. It scared me so bad, but was pretty hilarious at the same time.