Understanding why juices coming out of fruits is DOSH.
(Melting ice.) the accepted ruling with putting ice or frozen drinks into a warm area; defrosting dry foods in a warm area;
understanding the concept of גזרה שמא יתקע (a person might come to tighten it);
הכנה ליום אחר (Preparations for a Weekday): Washing Dishes on Shabbos for Sunday. Releasing a Halachic Vow (הַתָּרַת נְדָרִים);