What If the Placement Screws the Design Up?

When creating an advertisement, a poster etc. designers give full attention to the principles of design, try to make it attractive and nice. (I'm perfectly aware that some of the designs I will be putting below are not good, though.) But world is not always fair; sometimes unlucky things can happen to the design.
Some happenings are funny and entertaining but some are absolutely not! At least they're not permanent, so they won't do much damage.