I still remember sitting in bed when our big gray kitty came up the stairs trailing a sonic boom, (chasing something that flew into our bedroom) and LEAPT onto the bed, and made the weirdest BRRT-CH-CH noise I've ever heard, and staring intently at the ceiling.

Turns out a bat had come down the chimney!

The GF (long gone now, thank the Gods) started screaming "KILL IT! KILL IT!"

I got her out of the room, waited till the little fella landed on a notebook, covered him with a towel, and held bat, book, and towel out an open window, uncovered him, and let him fly away.

Told the GF - "How'd you like it if you got lost one evening, stopped to ask directions, got chased by a guy ten times your size and then squashed? Leave him alone"