There was a poster on MN over the last year or so who posted her DH and groomsmen doing a rendition of Flying without Wings that they'd rehearsed and surprised her with. Now that was special. It was absolutely brilliant.
I started off thinking it was clever, then about 8 mins in started thinking it was a bit show-offy, and then thought the end was lovely. Went on a bit though, maybe could have trimmed it to a verse and chorus per thank you.