Was your last visit to the dentist comfortable?

I was driving my mother-in-law, who has Alzheimer's, to the store one afternoon and she was reading all the signs aloud, as she was prone to do at that stage of the disease. I wasn't really listening until I noticed she'd burst out laughing.
Her laugh is very infectious and it made me laugh too, especially when I realized what had provoked her laughter - the sign she'd just read: "Comfort Dental".
I'd passed that sign on numerous occasions and had never caught the inherent humor. I thought that it was pretty amazing that, in spite of her Alzheimer's, she was capable of recognizing a euphemistic oxymoron. To be quite sure that was what had tickled her funny bone, I asked her, "Why were you laughing at the Comfort Dental sign?"
To which she responded something like, "That seems contradictory."
Apparently she, like many other people, had not found the majority of her dental experiences to be particularly comfortable.
After that, whenever we needed a little amusement, I'd just drive by the sign, and she'd invariably read it aloud and chuckle. She might not always remember who I was or that she was living with us. And she probably didn't realize she'd had the same reaction to the sign several times before.
But she still had that ingrained sense of humor that inspired her to laugh at the mixed concepts of comfort and dentistry. Which I think is a very interesting reflection upon both Alzheimer's and my mother-in-law's well-developed sense of humor.