Yea, it is weird. I know the the safari page has long to be scrolled but I was not able to damn scroll it 
Then this behavior was duplicated when I tried to do some stuff on the other windows as well..
Hehehee.. Apple has made the scroll bars AuToMaTiCaLlY for us 
I have been reading this book regarding UX stuff, it is a good read.
One thing mentioned on that one is consistency of UX designs – in other words you don’t want to surprise your existing users with something that has been there kind of thing.
I might sound silly here by mentioning this and you might say “what the heck, it is not a big deal”
But, for me, I like my scroll bars and I have returned them – thanks to them they have allowed us configure it
To configure it
1. Go to system preferences
2. Be on the Personal/General
3. Select show always option from the scroll bar options.
Scroll it BABY!