No Take Backs
A person sneezed in the library. Now it wasn't one of those "hold it in and hope you don't make too much noise because you are in the library" type sneeze. This person really let it rip! It startled quite a few people and it got a couple of giggles from a group of girls nearby. As loud a blast as it was, it only solicited one "bless you", just one. After a few seconds, the person who gave the blessing got mad because the person who sneezed did not respond to the blessing. In a matter of seconds, the blessing was taken back and replaced with one of those overtly sarcastic comments, "Fine! Don't say thank you!" designed to provoke an apology from the "ungreatful" nose honker.
Can people do that? Take back a blessing because they were not thanked for giving it? What's the reason for wishing people well? Do people keep track of the "good" things they do expecting some sort of payback? Some kind of "I did for you" so "You do for me" tally sheet?
In the end if the blesser had stuck around a little longer, she might have seen two people go up to the "sneezer" signing hello.

Song of the Day: "Games People Play" by The Alan Parsons Project