"צביעה באוכלים" (coloring in foods) - the stringent view of some poskim
Separating Challah on Shabbos;
Folding a shirt collar, flipping up cuffs from pants, hanging up pants with a very sharp crease on a hanger, folding tablecloths and sheets...
Introduction to clapping and dancing on Shabbos and Yom Tov;