Dropping Your Bike Hurts!!

This morning my heart dropped!  One of my roommates bought his bike (motorcycle) yesterday.  It was used & had slight cosmetic damages.  So this morning both of us decided to ride our bikes to work... 
 
We started off on the side street & drove toward the main street.  I followed on my ZX6.  As he initiated his first turn the bike slide from right under him.  It was painful to watch!  I just thought about how I have never slide like that & dread the day it may happen. 
 
His bike basically slide (due to the momentum of the curve) & stopped at the curb.  He got up & was pissed (but not hurt - thank god for his gear!)  I slowed down & stopped.  We took a look & there was some pretty bad "cosmetic" damages...  But I guess that's life.  
 
The plus side was that it happened on his first day, so he will be more cautious now.  Furthermore, he slide & hit the curb right in BETWEEN 2 parked cars!!  Yeap, that's right.. right in between!  If he was a little to the left or right he would have hit either car.  Thank god that didn't happen. 
 
The rest of the way to work, was sketchy.  It was my 1st time riding w/ someone else.  I found it more difficult, because I had to keep in mind where he was all the time.  When I rode by myself, I would be concerned only for my own safety... now I have to consider someone else as well!  I'm not used to that... but hopefully it will come in time.
 
But that slide... ouch, it hurt.  I'm just afraid of when that will happen to me :S  I don't wish it to happen... but then there is that saying:  "There are 2 types of motorcyclists:  those that have crashed & those that will..."  :(  Crashing, dropping, sliding are all experiences one may meet... but do we have to?  I've already dropped my bike - it was a learning experience.  But do I have to crash or slide to learn better?  I hope not!