If you don´t know that everybody saw the thread in their own name how can you than know it is not a security problem???
The other 99% of the people who found it obvious after a few minutes can tell you. But that really wasn't my point, I'm just explaining that there it wasn't
a security problem. With any prank there will be those who just don't get it, and then those who are a poor sport about it after they do, or even those who just don't like all the nonsense and we aren't going to give up on April 1st pranks for those who feel differently. They have the rest of the year to take themselves too seriously.
This has nothing to do with a deficit of humor by the person who sees it but maybe a deficit of humor by the person who did it.
Hey, the "security" problem could have been a lot worse