The Fairy liquid one with the kid who wants to build a rocket ship.
Annoying partly because the kid is so whiney, and partly because he's wearing a spaceman outfit when he asks for the bottle, but not when he plays with it. But most of all it's annoying because the new style fairy bottles just don't make a good rocket ship. Yes, when they were the iconic tall white cylinder they made a decent Saturn V rocket, but the new shape is not right for a rocket ship, therefore the spaceship he does build is just rubbish.