I absolutely love this thread, so I've got to respond, too.
I currently work in assisted living but before this I was in a SNF. But my favorite story comes from even before I was a nurse.
I was working as a direct care advisor in a group home for adults with developmental disabilities. We had a lady who was in her 70s, cutest little lady you'll ever see, sweet as pie most of the time, but any time she got irritated, there was a string of obscenities that would roll out of her mouth, not particularly directed at anyone, then the next minute, she'd smile and tell you she loved you. She had dementia in the very beginning stages.
She had lots of antics. We'd all be sitting quietly in the living room watching tv, and she would be recline in her chair. All of the sudden you'd hear, "HEY!! I'm watching tv real' good." With her little smile.
The absolute best was when I was stuck doing an overnight awake because we had a surprise hospital trip for another consumer, and I was reviewing all the documentation after everyone was in bed. This little lady always had major issues with her pillow being situated right. After about 5 or 6 times of hearing her down the hall, cursing, then going to fix her pillow, I walk in as she starts again and this time, she's so frustrated, she goes, "IM GONNA BITE MYSELF!" And proceeds to stick a meatier part of her hand into her mouth. I looked at her and I said, "but (her name), you don't have any teeth. You're gumming yourself!" To which she stopped, looked at me, and began to giggle hysterically for about ten minutes and agreed with me.
That was definitely high up there on one of my favorite moments.