Hidan no Aria/Awesome


 * Pretty much any time Reki makes a truly ridiculous shot with her sniper rifle. For example (also the first and possibly least impressive), she shoots a bomb off the underside of a bus from a helicopter. In the anime, the excellent music makes this even more awesome.
 * The climaxes of each volume qualify, with the opponents getting more and more powerful and the battles higher and higher in tension and epicness.
 * Kinji managing to  in Volume 4.
 * Volume 5 actually opens with one of these, a painfully epic battle between Kinji.