RotJ Death Star Scene
Okay, not sure if this has been asked already, so I am sorry if it was.
On the Death Star during RotJ, why did Luke throw his lightsaber away in front of the Emperor and proclaim himself a Jedi. I am fine with the proclaiming his being a Jedi, but what did Luke think would happen when he did that, and why did he throw away his lightsaber (his only real defense) when facing the most powerful Sith Master of all time? Did he think the Emperor would be like "I AM BLINDED BY YOUR LIGHT" and then jump down into the Death Star's reactor?
Please help me figure out what Luke was doing, or why Lucas had him toss away his lightsaber.