Caught in the Act -- Again!

This evening, after I'd made sure that the cat-flap was set to inbound-only, I heard the door swinging, and thought to myself "but all the cats who know how to use it are in, unless this is a visitor" -- but there was no sound of challenge from the cats who had just a little while before been at their feeding station nearby.

So, I wander into the lobby, just in time to see the hindquarters of a cat exiting through the 'In' door, clearly having hooked it open by the rubber rim and stuck a nose under.

Some cats are too clever for their own good!