Our cat is a wimp, and currently afraid of the cat next door. So we've had to put a litter tray in the front porch and a cat flap through the inner door.
Cat was mid-empty when the post arrived. As post hit the floor behind her, cat exited the tray, and was through the flap, across the lounge and up the stairs faster than the speed of light.
Deposit in tray not covered, so very smelly. One escaped small deposit on the tray edge, and another on the floor. Not a pleasant clean-up operation.
Luckily it appears that all that was necessary had been released before the panic run. A careful inspection of the route revealed no further deposits, so all good really.
She's been wanting a lot of cuddling all day since.
She's supposed to be a ferocious wild animal!