Strips

Dilbert mentions the forced nodding and smiling in the office several times. And there's a very funny Seinfeld monologue about making up new ways of greeting people that you already greeted when you arrived, once you run out of eyebrows rising, !$%*!$% smirks, handwaves and grunts.

OMG storm you are a teacher??????

in regards to the comic, it's like when people greet you by saying "How's it going" instead of hello.. and then they keep walking rather than wait for the answer...

Its how Random people hope to make other peoples days better (for example i Say "Have a good day" at the end of all my classes)