Toddlers, repeatedly emit high pitched shrieks when going up the stairs to bed, because you know your little sister has just been settled to sleep, and wake her.
When being picked up from nursery, and mummy's talking to key worker, announce loudly "I wanna lick your eyebrow" just so they think we're weird.
When being helped to do a poo and mum is only pulling up your pants for you, say loudly "I don't want poo in my mouth!" so neighbour sitting in kitchen will also think we're weird.
Refuse to hold hands and hide in the corner at the beginning (and throughout) a junior school tour conducted by the head, yelling "no, don't want to come! I want ice cream."
Kick dog repeatedly up arse.