I had similar type of "problem" years ago. Whenever I received a message in MSN Messenger (does anyone still use that btw?) the screen started to blink rapidly and I could see people and some objects thru walls until the "new message" window went down. At first I was like hahahah this is cool, it's like not cheating but still getting the benefits of it!! Then I got worried that some AC catches it and realised that by letting it continue I would in fact have been cheating.....