All them, frankly. I can picture it now:
GL: You used PoK!
Smokey: No, I didn't, I bought a druid port.
GL: You used PoK!
Smokey: No I didn't man, now let's raid, ok?
GL: Smokey, this isn't live, this is a progression guild with rules, and you used PoK, which is against the rules.
Smokey: No way man, come on, let's just raid, jeez.
GL:
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Smokey: Alright man, jeez, I'll gate and walk back, shit. (gates, goes LD)
GL: It's a progression guild, Smokey