Most games with stealth elements (Bethesda seems to have a good hand in this), where you can leave a corpse out in the open, in a supposedly "secured" area, and no one questions it.
In some games they'll look at it, some (ie, Fallout 3) may even have the AI take items from the corpse, so it's not a case of "the AI is incapable of noticing corpses". Hell, Fallout 3/NV even has the mechanics in place for the player to move corpses around, so it's not like it could be there for any sort of reason...
Just bloody ridiculous! D=