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

A taboo is an inhibition resulting from social customs or emotional aversion. Taboos serve a useful purpose to society because they prevent people from getting into uncomfortable situations. However, taboos can cause people to ignore certain solutions to problems, even if these solutions are very good.

A popular example is to imagine a pipe stuck in the ground with a ping-pong ball in the bottom. How do you get the ping-pong ball out using a minimum of supplies and without damaging anything? The taboo answer is to pee into the pipe, thus floating the ball out. This is a very effective solution and you may have thought of this answer, but if you had been in a group of people, you probably would not have verbalized it.

Since taboos exist to protect other members of society, you do not need to censor yourself when you are working alone. You might not end up with a taboo solution, but sometimes you must think through incorrect or unacceptable solutions in order to reach a correct one.
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For more mind exercises: http://www.braingle.com/mind/