#7. Eating your pizza.
The way you eat your pizza slices, you always drop most of your toppings. The correct way to eat pizza is by folding it a bit in a way that it makes a U. That way you will not spill your toppings.
#8. Heating two bowls in a microwave at once.
Why waste so much electricity and effort by heating the food twice? When you have two bowls to heat, just place one at the top of a mug. Both will fit in at once.