Congratulations, sdsearch. I have had this happen where they know me, but not ever where they don't. Funny how it makes one feel better about the world in general, especially if one finds out ahead of time and then has the meantime to feel that way. Even hearing that it happens to someone else once in a while can yield this feeling. Thank you.
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Come to think of it, this has only happened at Comfort Inns. Wonder if there's something to that? ...No, I think it's about being known, in my instances. Just thought I'd mention it in case it corroborates anyone else's experience.