Simple, how exactly is confusion Rped?

A lot has been said about how blindness/deafness should be properly Rped, but with confusion, I am a bit confused. Does the person confused remember he was confused? Does he remember killing his friend in the confusion? While confused, does one just think allies are just another zombie/troll/goblin?

Just some clarification on what exactly is happening when one is confused and afterwards, since I've run into a few issues with some other players. It might have been said in some thread already, but I couldn't find such.

When you're confused, you see things that aren't there. You might see a horrible demon (which is actually your friend), you might see a field of ponies (and wander around aimlessly), you might see yourself trapped in a cell (and stand perfectly still) and so on and so forth.

Huh?

*wanders off aimlessly*

Thanks Metro, Beggar. That cleared up my confusion. :)

A note to be clear - the things you see appear to be real to you. You won't realize it's a Confusion spell while you're under the effects. If it's happened to you enough, though, it's OK to realize what had happened after the effect wears off.