What Was Your Kid’s First Swear Word?

Skip right to 1:45. This kid is so smart, but he also knows that what he's about to say is a bad word. The parents have no idea it's coming, but the kid takes a $10 bill and covers his mouth. When they ask why, he responds: "So they won't hear me say _____"

What was the first sort-of swear word that your kid said? Or you for that matter?