Anytime someone starts dropping Warhammer lore, or shows a love of Boomer Shooters, I know I'm going to despise that person or they'll be my best friend, no middle ground, and I don't even like Warhammer.
Both the best and worst people I have ever met were Warhammer fans. The best guy keeps trying to get us to play 40k or Dark Sun. He's just a really good dude though.