Here's a weird one:
Precision: "You may ignore 1 figure or obstacle when tracing line of sight for a Ranged or Magic attack."
Pit: "While in a pit, a figure has no line of sight to any other spaces." (JitD) "Figures in a pit can see into the spaces adjacent to the pit." (FAQ/errata)
Can a hero use the Precision skill to ignore a pit obstacle that the hero is currently standing in and thereby attack spaces that are farther away from the pit?
Pits are obstacles, and Precision doesn't say you may trace line-of-sight through one obstacle that would otherwise block it, it says you may ignore one obstacle. By RAW, this looks OK to me.