Things can get messy if you are cutting a particularly large cake and only have a small knife, but even things like cheese and Swiss rolls can be difficult to cut precisely. You can use dental floss to make quick and precise cuts and avoid the trouble.
Grill fish on top of lemon slices
Fish will tend to stick and even break up when placed on the grill, but if you put it on top of lemon slices and grill it like that it will be much easier to prepare, and it will get that nice zesty flavour.
Chocolate cup lifehack
Melt some chocolate into a bowl and then dip an inflated balloon in it so that the chocolate sticks all around it in a semicircular shape. Once it has cooled down just pop the balloon and take it out. Voila! You now have chocolate bowls to serve your dessert in.
Peel a kiwi by cutting off the ends and using a spoon to slice around the entire thing.