Play in Toilet

Recently we found Vernon love to play water in toilet. A few tactics he used in order to get the chances to play water :

a) Go weewee -
Vernon : Mommy want weewee
Mommy : okey, after done he will.................say.
Vernon : wash hand
Mommy : I will hole him near to the washing basin and open the tap for him to wash.
Vernon : Want sabun
Mommy : I have to get some sabun for him else he will make his noise.
Once I open the tab, he will take the opportunity to splash the water everywhere. everytime I have to be very cautions in order not to make me wet.

b) Wash leg - Usually the 1st thing we did after come home is to wash our leg & hand.
this time, our vernon boy will follow behind mommy to the washroom. He knew mommy will help him to wash his leg, but the terrible thing is after washing his leg. He use his hand to play the water that he use to wash his leg. End up we need to wash over his hand again.

c) Toilet bowl - Lately we have to ensure we follow where he go even at home, as he love to snick in to our master bedroom toilet and tried to throw his small toy into the toilet bowl and there're 2 times I caught him want to play the toilet bowl water.
end up we always have to close our washroom door b4 we go to buy the toilet bowl safety lock.

Our tot really unpredictable, they love to play thing that we don't allow.
as a parents, I think we need to do some precautions b4 anything danger happen to them.
Actually, I'm very interested to know is other tot also love to play in toilet.
I knew there's a papa friend's son where we met during U.S Time, his father told us that his son threw his watch into the toilet bowl and flash it. He not only did once, but continueos throwing thing inside the toilet bowl. James's friend warn us that most of tot are about 18 - 24months old. They love to do all this.............now I believe what James's friend said.