Holy cow, I wrote a book!
Several years ago, the security department sent out a company-wide memo:
Over the next few months, we will be upgrading the card readers
on all of our major campuses.
The old card readers show a solid red light when the door is locked,
whereas the new card readers show a blinking red light.
Aw-right, a blinking light.
Now we're cookin' with gas!