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Sudden inexplicable stupidity. Some theorize a result of falling off bales of hay repeatedly.

There is no known cure. The only humane option is euthanasia via metal baseball bat beating.
Dar Webbous, suffering from Brad Syndrome, was fine yesterday, but today she has no idea where she is, how she got here, and evidently does not know how to dress or bathe herself anymore.
by Chelated January 27, 2011
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