Why not wait until you have been bathed, dried, dressed in an almost new, soft, white sleep suit, and then do an enormo, leaky poo. Your Mum will love you for it. So will the makers of stain removal sprays. Better still, make sure you also do it while sat on someones lap, so that you can silently leak noxious fluid onto their legs too.
A tidy toy box is a toy box screaming to be emptied onto the floor. Jigsaws are not real jigsaws until pieces are missing, and playdoh is best used as a crusty carpet enhancer. Alternatively conceal pieces of orange peel inside rarely used items so that your folks spend ages trying to identify the source of the rotting citrus peel smell.
The toilet IS a toy. It is all there in that all important first syllable. TOY-let. Whenever you briefly manage to escape their ever watchful gaze, use the bowl to splash about in with your hands and various cars, shoes, Mummy's phone. Whatever you can find.
Books are brilliant. You have hundreds. Instead of reading them all in turn, why not demand the same one over and over again until your mum can recite it off by heart while simultaneously cultivating a hatred of Julia Donaldson for being the toddler equivalent of book cocaine.
Stickers are the best currency there is. Money is just boring old paper and metal stuff that doesn't even stick to anything, why adults are so enamoured is a mystery. Stick stickers EVERYWHERE. On the stereo, the back of your parents so they leave the house adorned with them, and the all time number one location- inside pockets so they go through the wash and spread their stickery joy across the world.
Go forth my toddler brethren, and create havoc!