How to cut into cakes with lettering on top. (E.g. Happy Birthday cake).
Measuring for a mitzvah - "מדידה של מצוה". Preferably should be done on "ערב שבת".
Tearing or Making a Hole in an Item; Tearing Pieces of Paper, Aluminum Foil, Plastic Wrap, etc.
understanding מקלקל, working with an attic door;