Nonesuch #163 - How did that get there?

Let's start it this way. Twice a year I have mice. Usually one or two get in the house. I catch them in traps and that is it. Happens in the Spring when it starts to get warm and we have rain and in the Fall when it starts to get cool again. Over a week ago, I saw one run by me in the kitchen. Didn't think too much on it. I knew the traps would get him. Next night, he came out and hung out near where I was for a bit and then went on about his business. I didn't worry about it, but I did change the cheese in the traps just in case. This morning, woke up at 4am. Usual time. I would love to sleep a full night for once. Anyway, I go to the bathroom, lift up the lid and swimming in my toilet is a mouse. How he got there I do not know. I am thinking that he may have swam up my pipe. god, I hope not. There is no way to know if this is the same mouse I had seen earlier. I wasn't sure what to do, so I flushed it. I didn't want to pick him up, I didn't have a fishnet available or a large enough cup to scoop him out and it was 4am. I mean, I do feel bad about having to flush him but I am not sure what else I could have done. And I hope I don't see one in there again.