I work from home and stick an old poster frame in the doorway to stop my ferret from coming in coz I keep the window open. The frame's quite big - knee high - and just fits in the doorway and I thought Cosima would stay on the other side.
No way! One day I was at my desk and heard this noise. I turned and saw Cosima pulling herself up and over like GI Jane.
Had to remove the frame and went down to the hardware store to buy some plywood, which was even higher, to fix in the doorway to keep my girl out.
She now sits and sulks on the other side when she's not scratching on the wood in a temper.