3rd and 1, MNF vs. the Jets a few years ago. Jets throw a wide receiver screen to Surtain's man - the ball is caught - and Surtain immediately tackles the man, perfectly and effortlessly, right where he caught the ball. It was a thing of beauty. The Dolphins went on to lose that game, but I've never forgotten that play.
My favorite moment came against the Packers on MNF a few years ago. Favre was driving and threw the ball into the endzone. Surtain swatted it down while in mid air, then proceeded to balance the ball on his foot ( in mid air ) and bend down and pick it up off his foot for the TD saving int. It was the most incredible display of balance, concentration, luck and talent all in one. We lost the game but it was an amazing play.