This happens every spring and fall-birds, usually starlings come down our furnace pipe and into the basement. Usually it's pretty easy for me to get them out-just open the basement door and turn off the lights and they head right outside. Sometimes, though-the door to our upstairs is open and they come up and make a mess-flapping around, knocking stuff over, and pooping on everything. This one made it all the way to our upstairs bathroom, behind the door. I put on some gloves, grabbed him and set him free. Glad I got a pic first, though.