Self-Interaction [3.5e]

[First Speaker]

How would a character most easily achieve incorporeality, without extraplanar means, such that they were incorporeal to themselves as well as to the world around them - so that, say, their leg and arm could occupy the same space?

[Pirate_King]

so... all their ghostly organs would fall through them? I think you just need to write up your own interpretation of incorporeality.