Bingo. Upthread, I described a recent session where I decided to grapple a drider with my goliath EK, with the intention of pulling most of its legs off. My roleplaying intent was to make him a biped again in response to him prancing around like an arrogant twit because he was a big, part-spider dude. Anyway, the DM never took issue with my tactic. But, what *IF*, in secret, the adventure had a special rule in it for this particular drider having a powerful feature/ability based directly on the number of his spider legs he had intact. Whether I knew that or not, how many DMs here would immediately question me on why I wanted to tear his legs off, instead of just kill him outright? I can easily imagine at least a few posters in this thread would instinctively take me to task as a dirty metagamer and/or even outright call me a cheater.