How to cut into cakes with lettering on top. (E.g. Happy Birthday cake).
Moving a Candelabra That Has Oil in It on Shabbos. Using a Dimmer on a Light on Shabbos;
practical applications that apply to BONEH in conjunction with the structure of the house;
pull tab rings attached to orange juice containers, grapefruit juice containers, etc. (Making a nice usable opening on Shabbos.);