Anyone remember anything unique the groom's parents did at a wedding that made it special?

Our son is getting married and this is the first marriage in our family. I know the bride plays the biggest roll but is there anything you ever saw at a wedding that was super special that you remember that had to do with the groom’s parents(us)? Something they said or did that left a special mark? It has been so long since I have been to a wedding and thank goodness I am not planning this one because things have changed since we were married 30 years ago but the bride’s mom seems to know what she is doing. Glad now we had sons.