ABC's reality show Wipeout took on CBS's comedy hits The Big Bang Theory and $#!? My Dad Says Thursday night, and, for the second week in a row, wiped them out in the ratings -- certainly among adults 18-49. Wipeout attracted 10.65 million viewers while the two comedies averaged 10.30 million, but its numbers were nearly a third higher among younger viewers. ABC remained on top at 9 00 p.m., too as a new episode of Grey's Anatomy trounced a rerun of CBS's Csi Crime Scene Investigation. CBS took command, however, at 10 00 as its hit The Mentalist drew nearly twice the viewers who watched a repeat of ABC's new Off the Map.