fixing a Hat, Dust on a Hat, a Dent in an Aluminum Foil Pan, Plastic Fruit Cup, and Shaking Down a Thermometer;
How High off the Ground Are We Talking About When We Say One Cannot Make Use of a Tree? Shaking a Very Thin Tree...
more examples of "מבטל כלי מהיכנו" (nullifying a vessel from its normal usage) that come up on Shabbos;