You've been my captive little lab rat for several years. You been locked away in my secret compound, subject to my whims and experiments. It's a sad day for you, because today is our last day together. You see, I've done everything I can possibly do to you. You're not much more than a sentient vegetable. I'm going to get rid of you and replace you with a new toy to play with. That means I have to put you down. You've been such a good lab rat for me, I've decided to reward you by doing it slow and painless. A little injection will stop your heart and a little gas will put you to rest for good! Breathe deeply, little experiment...