Only wedding brouhaha I ever actually observed involved a girl I'd been in school with since the 7th grade. The summer before we all went off to college, she hooked up with this loser of a guy a couple years older and they had themselves one of the all-time whirlwind romances, culminating in their wedding that December (no, she wasn't pregnant). This guy had been (and remains to this day) a first-ballot Full of **** HOFer, so the conditions were right for something legendary.
They were married in the church in which I was baptized. She was asked "Will ya?" first and confidently answered in the affirmative. When it was his turn, he paused, wobbled a little bit ... and then a little bit more ... and then eased out a barely audible "I will" as he collapsed. The groomsmen helped him to his feet as the minister tried to get things back on track, but then he collapsed again, this time falling into a candelabra that barely missed setting the place on fire. The minister then pronounced them man and wife ... the groom lying on the floor, the bride looking on in horror. Bride and groom made their exit with her walking alongside his stretcher on the way out to the ambulance.
To this day people believe he tried to fake his faint as a way of getting out of it -- would have been entirely in character -- but he got mixed up and accidentally said the words on the way down. They were separated by the next December and divorced a year later, and he's been married at least twice since.