When the time comes for your brain to process the information, the second word comes up faster than the first one. So when it's in your head, all of a sudden, it comes out backwards and you think of the word backwards.
“Since September 11, security has been increased everywhere, and we have new IDs to get on to the Fox lot. I drove to the security gate, but realized I'd left my ID in my other car. I just broke into that voice - 'Hey, man, I'm Bart Simpson. Who else sounds like this?' The guard waved me through.”
“We could say we want the Web to reflect a vision of the world where everything is done democratically. To do that, we get computers to talk with each other in such a way as to promote that ideal.”