Misunderstood ? Out of Control? 

Let Me In !

"Bubble" regularly scratches on the neighbours' window pane to be let in.

(It also chases birds, sometimes catching them, and other cats - and gets chased out of my garden by me for such behaviour and for using my garden as its scent-spraying place (all over my kayak, all over my recycling) and as its toilet :-P !)