How much time is needed before or after shabbos to say it is "שכר שבת בהבלעה" (shabbos earnings included with weekday earnings).
The difference between one letter or two letters; writing with a "SHINUI" (not the usual manner). One letter on top of another letter.
Cutting Dental Floss; Questions Which Come Up with Toilet Paper; Opening Small Packets of Sugar, Ketchup, Salt, etc.