Question...

EDIT: I have been informed that my rant did not have an opening tag. So:
<rant>
Why do people feel it necessary to ask how I'm doing when we pass on the way to class? A quick "Hi" I can understand, but why, when I'm walking quickly towards the classroom, in the opposite direction from them, do people ask "How's it going"? It's even weirder when I'm on my bike, and I'm almost past them before they're finished speaking. What am I supposed to do, shout out a quick summary of how my day's been going as I zip by?
</rant>