Cases when food, drinks, wax, etc. fell in an area where there is NO letters, numbers, pictures.
understanding the concept of גזרה שמא יתקע (a person might come to tighten it);
Folding Garments on Shabbos, קיפול בגדים (Kipul Begadim). How הכנה (Hachana) Has to Do With Folding Garments on Shabbos;