Ok, my FH and his friends are the biggest practical jokers.....I know they are gonna do something silly at the ceremony........(the last wedding that they were all in involved flipping a coin when asked if the groom took the bride.......the one before that a ringpop) so anyways now that you have a little background I am trying to come up with a practical joke to get them with....I figured if you cant beat them join them right?
tia

one of the things i've seen on you tube was the couple played a joke on their guests at the reception... they started out doing this really sweet slow dance for their first dance, but then they had the dj switch like 30 seconds in to this fun upbeat song... when the dj switched the couple looked around pissed off and then just shrugged and started dancing funky and enjoying themselves... just an idea

There are tons of those videos on YouTube. It's a really fun idea.