Jack White kicked off his ‘Suppy Chain Issues’ tour with a bang in his hometown of Detroit on Friday. White brought girlfriend Olivia Jean onstage for a duet of the White Stripes song “Hotel Yorba” – then pulled out a ring and proposed. But that’s not all: family members joined the couple onstage and they were married on the spot – before White went back to finishing the concert. White and Jean will have to find time to honeymoon on the road – Jean is serving as White’s opening act on the tour, which runs all the way through August. What’s the most surprising thing you’ve ever seen at a concert?