Sassy, one of my first gliders has always been my trouble maker -
Her escapades include
Finding a small space under the bathroom counter that allowed her to get INSIDE the cabinets - I covered the space with duct-tape and eventually had the cabinets and counter replaced all together because she tried every night to get the tape off.
She showed me that the corner support for the glass shower enclosure was a hollow tube with the top open. I permanently stuffed that opening with a washcloth before she actually got into it.
One night she moved the towel away from the door and slipped out of the bathroom - not just out of the room, but through a metal bracket under the pocket door that had an opening 3/4 inch high by 1 1/2 inches wide - She was INSIDE the wall in the space where the pocket door goes. I coaxed her out with meal worms the way she went in, but I was just about ready to punch a hole in the wall to get her out. I put two of the wooden perches that had come with the cage - but had not been used - through the bracket to fill the opening. They also could be pulled out when the door was closed to fill the gap under the door to keep her from slipping out again.
She has also slipped under two doors to go explore my son's room and opened the slide up feeder door on the cage (with the help of two cage mates) so the three of them could run around the house at 3 am. I had forgotten to secure that door with the twist lock after I had redecorated the cage that day.