my children fight about who farted

Lucy finds farting hilarious and, on the relatively rare occasions when she does fart, she announces proudly, "My butt made that noise!" Once, not all that long ago, cantankerous older sister Iris argued, "No, MY butt made that noise!" They were headed towards tears, arguing loudly, when I interrupted and suggested, "Maybe BOTH your butts made a noise at the same time! You both farted!" Peace was restored.