i could tell you, but then i'd have to kill you
If I told you my secret, I’d have to kick you in the face with my bare foot.
My neighbor said, 'I could tell you, but then I'd have to kill you,' and I got scared.
At the park, my friend said, 'I could tell you, but then I'd have to kill you,' and I ran home.
My dad said, 'I could tell you, but then I'd have to kill you,' and I asked for a snack.