INDEPENDENCE TOWNSHIP -- If there's a Happy Hour in Hell, it probably looks a lot like a Slipknot concert -- or at least the one the group put on Tuesday night, July 28, at the DTE Energy Music Theatre. The latest stop on the masked and costumed metal group's Summer's Last Stand tour was a high-octane, high-volume and highly theatrical celebration that featured macabre figures striding, leaping and riding moving platform around a two-tiered stage, plenty of fire and lyrical brimstone, a few invocations of the number of the beast (666) and a large jackal's head above the stage to watch the proceedings -- along with an international audience tuned into a Yahoo!