I've never heard of a fight, either. The closest was me (at home) yelling insults at the TV because the appraiser was a complete ignoramus.
Not that I'm an antiques expert, but I've been a Disney fan since I was a kid. One person brought in animation stills from Snow White. The "expert" pointed to a cell with a squirrel and a chipmunk and claimed that they were Chip and Dale. Oy!