Piggy Bank

The reason why you should always use a piggy bank that is indeed in the shape of a pig is that the pig scares off thieves, mice, and ants that would take your money.  Many people do not know that long before pigs were used to obtain bacon (okay three days before) that pigs have always scared thieves, mice, and ants.  Pigs scare thieves because they are afraid that the piggy bank will slip out of his or her hands and break to pieces.  Then they would be assigned to great task of collecting small bits of money.  This obviously only works if you smear crisco all over the piggy bank (Another little known trick is to use the piggy bank as the home for your pet scorpion - everyone knows thieves don't like to be bit by scorpions, and it will help deter ants.  Pigs scare mice (mice are the main ones stealing your money by the way) because pigs eat anything, including mice.  Pigs scare ants only if you have a pet scorpion living in the pig.
You must not have an exit hole (only saving not spending) if your intention was to ever save any money.  The entrance hole must be small enough that it is impossible to get money out.
Also, the piggy bank must be able to withstand not only a hammer, but also a rented jackhammer from the local tool shop.  If it is easy to break then it will be easy to spend.
The idea of a piggy bank is that it must be opened with something that has not been invented yet, something far into the future.  How far?  That depends on your financial time horizon, the patent of the inventor and her or his production schedule.
One key thing to remember - no matter how frustrated you get with your piggy bank never use it for dumping waste (a latrine, loo, or toilet).  If your do you will only have dirty money.  Who wants to be stinking rich?

 "Wealth gained hastily will dwindle, but whoever gathers little by little will increase it."
                                                                            Proverbs 13:11