We all make mistakes in life but some unfortunate folks end up seeing their mistakes immortalized. In most cases, that's because they captured the internet's fascination for the wrong reasons and the internet often has a good memory for that sort of thing.
However, those in design fields can sometimes find that their brain farts will find themselves as part of a permanent structure so people can pass by them and think, "who thought that was a good idea?" for years to come.
But as we look through these baffling examples of bad design, it's important to remember one thing: Someone may have come up with it but at least one other person saw it and gave it their stamp of approval.