I have a bat in the house. Dunno how it got in here. I heard a noise behind me, so I say "Do I hear cats being bad?" No response... Say it again; crickets. Turn around to look, and there's a bat flying across the room. Time to go bat hunting I guess. Maybe a box is the thing to use. Haven't caught/shoed a bat out in ages. Forget how I did it.
edit:
Got it! It made it easy(ish) for me. I went in the other room, and found it hanging on an air intake over me head. Clapped a box over it, and thought "Now what?!". Saw a paperboard beer carton /just/ in reach, so I nudged over with my toes, lifted it slightly so I could bend down and grab it, all the while holding the box over the bat. Dump the beer out, rip the box seam, and slide it between the vent and the bat. That's when the chattering started! Got everything in place as best as I could tell, and tried to remove everything without leaving gaps. The thin paperboard started to collapse into the box, but I got the door unlocked, and everything launched onto the front porch. I'm now bat free(I hope), and the bat's safe and sound; ready to find a new place to hangout.