Sometimes they get trapped in the pantry, which has a glass door. I think that's pretty neat as we get to see them up close. They are really rather cute, like mice. The German word for bat is Fledermaus, flying mouse.
When I was a little girl a bat flew into my sister's room and I had to rescue her by thunking the bat with a broom. She had convinced me that the bat was sure to fly into her hair but wouldn't fly into mine; yes, I was rather gullible back then.
The absolutely worst place I have ever found a bat in the house was in the bottom of the washing machine after I had taken all the clean laundry out. It was a very dead and very clean little baby bat. Yes, I rewashed that load of laundry.