'Mesmerised'???????

Caught Kitty doing his 'window thing' this morning shouting at me to get in......
but then I noticed him looking straight up so 'mesmerised' he never even noticed me with the camera...
I took several shots all the while trying to figure out WHAT was he looking at??????
And the only thing I can figure is.....that if you look closely you can see steam puffing up out of the just boiled kettle!!!!!! what would he find so interesting in that?????
Well, when I let him in I asked him and do you know what????
He wouldn't tell me what he was watching!!!!