Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Types of Forgetting

You may remember that most memory problems occur at the retrieval step [ For more on 'retrieval step' go here: http://www.braingle.com/mind/112.html ] in memory. There are four common explanations for why we often fail to retrieve the information that is recorded in our minds.

One type of forgetting is a result of repression. This usually only applies to traumatic or unpleasant experiences that we are motivated to forget.

Another type of memory problem is related to the accuracy of recalling certain memories. As we age, memories may become distorted to reflect the way we want to remember them or the way other people have remembered them. Sometimes couples who have been married for a long time remember things that happened to the other person as if they had happened to themselves.

A common type of forgetting is due to interference with another memory. Something you learn now may interfere with a memory from the past, and vice versa. The more similar the memories, the more likely they are to interfere with each other. For example, remembering this week's grocery list may make it harder to recall what was on last week's grocery list. Memory techniques can be employed to reduce interference.

The last type of forgetting is due to your inability to find the right cue to find the memory. This results in the "tip-of-the-tongue" phenomenon where you know that you know the information and you just need something to jog your memory.
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For more mind exercises: http://www.braingle.com/mind/