Stand up in your buggy whilst mummy is trying on clothes in the shop, pull your trousers down and inform Daddy, and the whole shop that, "My WeeWee is UP!!"
To see how fast mummy and daddy can leave a restaurant, insert your finger into your nappy and pull out a finger full of poo to brandish at the whole place!
Teenagers - it doesn't matter that you have not one but two expensive bikes, and that you owe your parents £73, complain bitterly that you need new handlebars and insist that the alternative new grips they suggest, at one fifth of the cost, will be entirely inadequate, then sulk and gloom for the entire weekend because you aren't going to be doing any decent riding until you get back from holiday.
When mum points out that your fortnight in the south of France hardly qualifies as something to be miserable about, stick a sullen look on your face and refuse to accept that you will have any fun at all on said holiday. Do this last thing at night, ensuring that your parents don't get to go to bed when they are knackered, and then repeat in the morning to ensure you spoil the weekend.
....And breathe!!