When i'm in someone's presence, i may become charmed by someone (whose intent is to charm me) whether its because they think i'll be more forgiving or lenient towards them. This type of charm derives from a form of social/mental manipulation. Thing is, I'm not usually aware i'm being charmed when i'm in the presence of the person. But once i'm no longer interacting with them, i'll usually if not suddenly become more conscious or aware of all the crap they fed me or charmed me with, and then i'll feel very silly that i was so easily taken in by the charm even if i didn't give in to anything they requested.
The other type of being charmed is when someone is really not trying to be charming, but i find myself charmed by them (they had some sort of effect on me), and then i begin to respond to them by being very attentive, smiling, face lighting up, becoming more relaxed and easy going, only to feel really embarrassed later on when i realize that i was too obvious and because they were really not charmed by me (lol) and i didn't pick up on this rather. In other words, i let my feelings show too easily. I'm not good at being cool.