It never ceases to amaze me how the modern domestic cat can be at the same time amazingly graceful and mind-numbingly clumsy at the same time.
Our cat, Cally, was walking up a ladder I had set up to provide access the storage area under the house. She easily managed the first 6 rungs, and then was apparently distracted by a passing neutrino and missed the next step, falling to the floor (only about a metre, the incline is only about 30deg).
She quickly realised I had watched this, put on her best "I meant to do that" face, and jumped back up to where she was and continued her journey as if nothing had happened.
What a wonderful source of entertainment they are.