People are like pizza.
Divided to multiple pieces so they can be shared by many people. Some pieces may have more pepperoni than the others, some have a little too much cheese, some lack enough bacon. No two pieces have the same amount of toppings; hence, no two people can have the exact same piece of that pizza. Sometimes one person gets two pieces, sometimes one is enough, and sometimes two people share a piece. Some people leave the crust out. Some people eat the crust first. Sometimes people put hot sauce first before taking a piece. Some people remove all the mushrooms or all the pineapple from their piece before taking it, while some people are fine with everything the piece offers. And lastly, some pieces are left over.