For freshers fair, our lovely publicity officer printed somewhere around 500 flyers for our society.
And no, she hadn't checked the society's website address was right, since she didn't really understand what it was.

They all had to be changed. By hand.
Somewhere, there's a manager thinking "...so all we have to do is go round to the house of every user who sees this website, and change the URL in their browser manually!! great plan!" :-S