I even went an extra step for cooling my 360... in addition to having a Nyko Intercooler on my 360, I purchased a handheld fan from Bed Bath & Beyond for $9.00; which runs on AA batteries. I place that fan on the HDD side of my 360 when I plan on playing it for a prolonged period of time... nothing but cool air around the 360.
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Introduce a little anarchy, you upset the established order, and everything becomes chaos!