Start by asking the Bride to put her right hand on the table , and the grooms left and right hands on top of hers. After you speach end it with

Now, in case any of you are wondering why I asked groom to place his hand on top of bride, I will tell you now. Grooms name ... as my final role as your Best Man, it has been with great pleasure that I have been able to give you the last five minutes in which you will ever have the upper hand over brides name.