When I got my wisdom teeth out, I discovered that anaesthetic makes me very determined. When I woke up, I wanted my teeth. When they didn't understand my hand gestures, I demanded paper so I could properly demand my teeth. They just kept telling me to lay down while they explained my restrictions to my mother, who'd driven me there. I staggered up to the counter and read the piece of paper with the list of things not to do or eat, didn't quite understand one of them, and demanded an explanation. Actually, Mom says I demanded an explanation three times, since my short-term memory was shot.

Then when we got home, I stood up to visit the restroom to rinse out my horrible bloody mouth, and fainted for the first and only time ever.

So the side-effects can be interesting.