Making a "ROSHIM" (mark) on paper, on a page in a sefer.
(Melting ice.) understanding the difference between "מוליד" and "נולד"; leaving out frozen items on a counter;
Picking Up Fruits Which Fell Off the Tree on Shabbos. Walking on Grass Barefoot;
Reopening a Hole in the Ground That Was There from Before Shabbos;