In the tradition of "Rules for Shooting Groomsmen"
1. Maintain a strict sense of decorum. These are the photos that will end up on the mantle for generations to see, and the parents and older relatives will want to order copies.
2. To make that easier, try and get these photos done before the alcohol is served.
3. Never upstage the bride and groom. They are the stars of the show.
4. Make sure that you get a clear, flattering shot of everyone in the party, that way everyone will order copies.
5. To heck with it. Gauge the desires and attitude of your bride and groom, and the party. Wedding photography shouldn't be one-size-fits-all.