There was no dancing at my wedding (I have 3 left feet) and I had some control over what went on, but for my son's wedding I wasn't sure what I would do (3 old left feet and he had inherited at least 2 of them). So I joked around about using Jefferson Airplane's "White Rabbit." You know "one pill makes you larger and one pill makes you small and the ones that mother gives you don't do anything at all." Scared my DIL out of a mother son dance - I would have actually picked "I Hope You Dance"
However I am now working on Alice in Wonderland curtains for the not quite born yet grandson. The bumper pads and quilt are already done. And DIL picked out all of the fabric. They were looking for that theme. No telling how everything works out. But Grandma can't dance!