Muffins - if muffins are stuck in the tin, place tin on a folded damp and wet kitchen towel. After a couple of minutes, the muffins will slide out easier.
Eggs - to separate white from yolks easily, break egg into funnel, and let the white slide down. The yolk will remain inside.
Opening a jar with a stubborn lid - to prevent your hand from slipping, wear a latex glove.
Ants - if you want to keep ants out of your sugar container, place some cloves inside. Ants don't like cloves.
Too much salt - if you added too much salt to a pot of soup, put in a halved potato and let cook a bit more, and it will absorb the excess salt.