The "dance tunnel" is one trick I've added to my DJ repertoire that makes for a good time and great pictures. Here's how it works...
All the guys on one side. All the gals on the otherside. And down the middle they come two at a time. This get's really interesting because the next time down you may be dosey doe-ing with someone new.
The "dance tunnel" is usually done after the cake is cut and the party has been turned up a notch. Check out Nate and Sarah in this picture taken by http://www.oncelikeaspark.com