Cutting between lettering on a cake that is attached. (Written in script). Eating cupcakes with writing on top of them.
Measuring for a mitzvah - "מדידה של מצוה". Preferably should be done on "ערב שבת".
חסרון כיס Chesron Kis: Halachas of This Category of מוקצה Muktzah;
Understanding the concept of "הפסד" (paying for losses).