Dual Purpose
Why do we get doors built for restrooms? So that we can privately do our business. There seems to be ample space in the bathroom for a toilet but the architect thought that for some reason it would be a good idea to build one right next to the door, so close that the door is not able to close. The architect failed but the residents came up with a genius idea. They carved out the chunk so as the door could shut. A pervert can still peep in though.