When we still had mice and when one of the mice got into the poison laid out, one of them staggered into the kitchen once. I wasn't there, but from what I'm told he didn't seem to be in his right mind. He bumped into my mom's leg and when she screamed he just stared up at her. After that he went behind the fridge, ignoring the trap set there, and died by the next day.
Another time I was about to enter the bathroom and almost stepped on a half-dead mouse in the middle of the floor. He was still alive, but seemed to not be able to see or hear anything. He'd move if I poked him, but not much. I put a box on top of him and waited until he died a couple of hours later before I threw him out.
Found tons of dead mice in the pantry around that time, too.
Another time I was about to enter the bathroom and almost stepped on a half-dead mouse in the middle of the floor. He was still alive, but seemed to not be able to see or hear anything. He'd move if I poked him, but not much. I put a box on top of him and waited until he died a couple of hours later before I threw him out.
Found tons of dead mice in the pantry around that time, too.