Oh, no! I'm aware of my tongue!

Think about your tongue. Now try to forget about it. You can't, can you?

Had you told me "don't remember it" or "don't think about it", I would have been a lot more likely to not forget it, but using the word forget actually allows me to forget and cancels out the think about it, because my subconcious mind cannot think about it and forget it, it cancels out. :)