It sounded like 3 or 4 loud people booing. It's still a controversial topic that violates strongly held traditions with lots of people. I think a gay military wedding, for example, would be maybe a little weird.

Military Wedding Arch of Sabers
A Marine Corps tradition, often adopted by the Air Force, is for the last saber bearer to "tap" the bride with his saber and say, "Welcome to the Marine Corps, Ma'am."

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma