Ritz sometimes does this too. When I hold or pet her, she is purring and really "into" it, then I put her down and she will at times lunge at my legs - in the summer time those bare ankles are murder!

I know what to look for (Karen, she kind of gets that "Scooter" look in her eyes). I immediately get on her level and say NO RITZY and that usually does it, or I have a fake mousie ready to throw so her play aggression is directed to that.

I do think in Ritzy's case it's her way of wanting to play or wanting more attention. When she does try to "attack" she has always been very mild - not really a bite, but opening her mouth and laying her teeth on me, hugging with legs, but not really scratching. But I am careful, she does get wild in play sometimes---just have something she can run after and attack that is "inanimate"

Good luck!