The two patterns that I found examples for was the Sign On design and the Exit Guard design.
Sign On Pattern
When reading about the sign on pattern. I thought of every online accounts that I have (Facebook, Gmail, Yahoo, Blogger, etc.). Here is a perfect example of a sign on design.
Exit Guard Pattern
I noticed this pattern every time, I am pushing the back button out of my applications. Here is an example of the exit guard in one of my game apps.