* Declare yourself the victor without producing a scap of a shred of a scitilla of evidence against evolution.
This one is definitely one of my favorites. A sub-category for this would be "Proof by repitition" where the creationist simply makes something up, keeps repeating it in the face of sound refutation and then somewhere down the line comes out with "Now that I have proven such and such..."
Examples abound in these these threads started by the most famous practitioner of this tactic:
http://
EvC Forum: Natural Limitation to Evolutionary Processes (2/14/05) -->
EvC Forum: Natural Limitation to Evolutionary Processes (2/14/05)
http://
EvC Forum: A barrier to macroevolution & objections to it -->
EvC Forum: A barrier to macroevolution & objections to it
Highly amusing (albeit extremely frustrating) stuff there.