In our household, I make a rice dish sometimes that is named after my son's reaction to it when he was about 3. Knowing he liked rice and sweetcorn, I presented him with this dish that includes both, only for his little face to crumple and him to give an anguished cry of 'MUMMY, WHY DID YOU DO THAT TO IT?!'
So of course, it has ever since been known as 'Mummy why did you do that to it?!' (I've even crossed out the name in the recipe book and written it there). DS is now 11 and actually likes MWDYDTTI these days, although he still leaves the green peppers.
Is there anything that your household now refers to by something memorable one of the kids has said?