Sign On and Exit Guard
This was a screenshot I took of the login for my Pinterest account. But I use the sign on screen pattern for many of my apps including Instagram, Skype, Bank of America, Yelp, GooglePlus, etc. Most of the sign on patterns look extremely similar to this.
Exit Guard Pattern
This is a screenshot of my bejeweled app, and this "Are you sure you want to exit?" is in most, if not all, my gaming apps.