Weird spoiler

Have you noticed that when you read a spoiler message and then you move the mouse away, you can still see the spoiler message in blue letters insted of white? Tell me you do see it :/

>>4
I'm not talking about spoiler links idiot! I'm talking about the effect your eyes play when you look at white letters on black background and it happens for a split second when you move the mouse pointer off the spoiler.

I'm guessing it's this:

http://en.wikipedia.org/wiki/Afterimage