Why does water whirl when flushed and why does tomato juice form rings?

[Joonasja]

Hi everyone!
I have two rather simple and everyday phenomenons that I can't explain.
1) Why does water whirl when you flush it down, why doesn't it go in a straight line?
2) When you're drinking tomato juice, then why are there rings on the glass (after every zip there remains some juice on the glass, but why isn't it "even" in every place but forms rings.)?

 

[JaredJames]

Please show your attempt at these questions as per the guidelines.

Jared