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

Stereotyping is an inescapable habit of the human mind. You are constantly making stereotypes without even knowing it. The mind simply cannot store every detail about everything that passes through it, so it tries to simplify things by sorting them into groups that are consistent with information that already resides in your memory.

For example, without looking at it, try to imagine what the face of your watch looks like. Does it have numbers for the hours or is it just implied? Are there any words printed on the front? What color are the hands? Chances are you cannot remember every detail of your watch even though you look at it several times a day. This is because your mind knows how to deal with watches so it stereotypes your watch and forgets about all the inconsequential details.

Topics that are important to you are unlikely to be heavily stereotyped, whereas unfamiliar topics will be heavily stereotyped. If you are uninterested in mountain climbing, it is very likely that you have a bunch of stereotypes about that particular sport. However, an avid mountain climber knows so much about the topic that few stereotypes remain.

Stereotypes can also affect the way you unconsciously feel about something. If you are allergic to bees, it might be difficult for you to think of them as beneficial insects that you might want in your garden.

Just being aware that your mind is full of stereotypes will help you look at things with an open mind. The next time you are trying to solve something, ask yourself if there are any stereotypes that are constraining your thinking.
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For more mind exercises: http://www.braingle.com/mind/