Understanding "פסיק רישא דלא ניחא ליה" (inevitable results from one's permissible action whereby one receives no benefit from).
interesting cases that come up with items that are not made to stay in their place all the time.
ודבר דבר (Dabair Davar): Hinting to Someone to Do an Action After Shabbos Which Is Not Allowed to Be Done on Shabbos;
What Are Some Examples of Drinks That Are Not Allowed to Be Strained Out מדרבנן (M'drabanan)?;