Most weddings don't involve the dramatic interruptions and emotional fall-outs of a romantic comedy, but some do.
There are truly few scenes more cinematic than the sight of someone interrupting a wedding ceremony to air their grievances, or better yet, expose some dirt on the true nature of the couple.
My husband and I got married in a public park, near a bay that we grew up fishing in.
Mid-ceremony, a little fishing boat motors on by, with two guys in it. The are probably about 80 yards away, holding beers. One says "Look, it's a wedding." About a minute later, the other yells, "SHE DON'T EVEN LIKE YOU!" My mother-in-law yelled back, "DON'T MAKE ME CUT YOU AT MY SON'S WEDDING."
Forever immortalized in my wedding video. That's what I get for having a wedding in a public area.