The Canon 10-22mm allows me to take photos of unsuspecting subjects up close without them realizing that they are within its ultra wide view. An ultra-wide angle (UWA) is the perfect lens to capture a person and his/her environment.
All photos here were shot at 10mm, the widest point of its zoom range.
Photos of persons shot with UWA may not be flattering due to various types of distortions. You can read my writeup here.