Bloody hell Linkat.
You know, people just wont wait even a few seconds for anybody to move out of their way in the supermarket will they (or on the roads either) and this kind of behavior is indicative of that.
However I don't think I would have laid my hands on this person!
Perhaps I would've just had a stern word with her but who knows. The supermarket can bring out strange behavior in everybody.
My mother had her bottom smacked and was told "naughty naughty" by an elderley lady once (complete stranger) when she was looking at the cream cakes!!!