take a running jump at it and don't always make the jump properly (especially if being chased by the other!) they haven't ever tried scratching them though - they have plenty of posts for that.
that's one thing i can't recommend enough - lots of scratching posts and places to climb. my two love to climb.
the mrs has had her birthday, and along with it our last decent holiday for a long while. while we were away, my parents got a ton of decorating done in the living / dining room. just fixed a leaky radiator this morning, and i helped dad with drilling holes into the 13 or so cat 