BYU violatation moment and dreaded question

So, this story calls for a preface... any of you who are not familiar with BYU should know, there is a dress code- no short shorts or skirts, sleeves are a must, and no low cut shirts. Anyway, so, with that in mind, I am walking around BYU campus in my perfectly modest, in with dress code skirt (comes right to my knees), I suddenly notice I don't feel my skirt hitting the back of my legs like I should. So I reach behind and sure enough my whole skirt is resting under my backpack (I have had that backpack since my sophomore year of high school, so it sags a lot lower than it should and tends to pick things up. So, sorry all who had to see that awful scene- swear I did not mean to- it's a good thing I don't get embarrassed very easily.

On to the dreaded question... call me socially inept but I hate it when people say "what's up?" I don't know what to say!!! Because if they say it as they're passing by you, it's not like they REALLY want to know whats up, where you're going, what you're doing, etc. but if I just smile and say hi, I feel completely rude and like I just ignored their question- everyone else seems to handle this question just fine- it's just me that gets all flustered! Oh well, maybe someday I'll grow up and learn the answer to this question :)