The Bikini in the Soup - S6-E14
Corrected entry: At the very end when Brennen brings the machine guns to Booth at the shooting range, Brennen puts on ear protection, but Booth does not, and he starts shooting. This would never happen. Booth, as an FBI agent who frequents the range, knows that one rule of any shooting range is that you must wear ear protection.
Correction: There is no mistake. You can see he's wearing ear plugs when he's firing his pistol. He never takes them out, so there's no need to put them back in.
Bishop73