Sometimes I convinced that in a given day, my expression is set in such a way that begs for people to acknowledge me and greet me.
No one said a word to me all morning. Seriously. It wasn't sad or remotely abnormal -- it wasn't even noticeable.
Then suddenly, five people in the past 40 seconds walked past me from all different directions; they flashed really big smiles and uttered some combination of "Hi! Hello! How are you today? That's wonderful! You have a nice day, now!" in boisterous, jubilant voices.
0_0 Cue "Twilight Zone" theme music.
Hello, nice people! I'm slightly creeped out but for the most part am appreciative of your friendliness and unsolicited concern for my well-being!