I recently assigned a story that was published today on aisledash.com on first dance videos. I had the writer pull together 10 great surprise first dances - you know the type, where the couple starts with a traditional first dance and surprises their guest by suddenly dancing to a choreographed upbeat song.
Anyway, one thing I noticed with almost all of these dances was that it took a long time to get to the surprise. One couple slow danced for a minute or so before breaking into the upbeat choreographed number.
My advice is that if you are going to surprise your guests keep the slow or traditional dance to no more than 30 seconds.
Another tip is to let your photographer and videographer know what you're planning so they aren't recording the dance from behind you. You'll want to see the smiles on your faces when you watch your wedding video.