Let it be known: McCovey Cove doesn't have a monopoly on strange watery MLB happenings. The scene on the Allegheny River outside PNC Park was as wacky as anything we've seen in San Francisco on Sunday, as a fan appeared to have brought a hoverboard to the Cubs-Pirates game. Marty McFly would have been proud -- and after all, we're only two years away from these things being widely available: