In brazilian jiu jitsu, an interesting tactic is to do a technique that your BJJ training partner has never seen before.
If your BJJ training partner has never seen the attack before they probably do not know how to intelligently defend against it.
This BJJ video tutorial shows a sneaky choke from top mount.
InFighting MMA is a Martial Arts Academy located in Downtown Vancouver specializing in MMA, Brazilian Jiu Jitsu and Kickboxing.