Most of my lap cats were broke pretty well of that crap. One would do it when my scratching hot good to him and he'd pop those razors. The would quickly pop back in when I said I was 'thump'.My knees are always full of pin pricks.....
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Right on the word thump!
He was stubborn to break, but quickly caught on to the word thump and it's happening to the offending paw.
He didn't like it, but like getting petted more!