Hi, I thought you may like this Mentalrobics exercise from Braingle.com:
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Interference

We learned in Types of Forgetting [ For more on 'Types of Forgetting' go here: http://www.braingle.com/mind/114.html ] that interference with other memories is one way that we forget information. Mnemonics such as the Peg [ For more on 'Peg' go here: http://www.braingle.com/mind/177.html ] and Loci [ For more on 'Loci' go here: http://www.braingle.com/mind/110.html ] systems rely on pre-memorized cues. As a result, interference can occur when you use the same cues to remember different lists. Typically, the new list will weaken the memory of the older list.

There are two ways to get around this. First, you could construct multiple sets of locations for the Loci system, and multiple sets of pegwords for the Peg system. Use the different sets for different types of memory tasks and you will reduce interference.

Another way to get around this is a technique called "Progressive Elaboration." This involves the modification of your visualization to incorporate multiple items (one from each list). For example, let's say that you are already using the Loci system to link your front door to a zebra. Now you want to use the Loci system to also remember an ice cream cone. With progressive elaboration, you would incorporate all the items into one visualization (the front door with the zebra with the ice cream cone). Now you can remember multiple lists using the same loci or pegwords.
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For more mind exercises: http://www.braingle.com/mind/