So said my youngest student when I cheerfully accepted his suggestion that we use the verb "to fart" as our example in an explanation of the perfect and progressive tenses. As in: The pig was farting that day where often it had farted before. Half an hour later, he could still explain back to me the differences between simple past, past progressive, and past perfect, without needing to resort to porcine flatulence. I don't care if that's his default verb for every grammar explanation we do for the next five years, as long as it works.