Well, I don't seriously use this stuff to discipline. In your case, I probably would have told the truth, that his actions were catching up with him, etc.
However, I used to tease my daughter. I once said something sarcastic to my husband about how "Moms have eyes in the backs of their heads..." My daughter (around age 2 1/2 -3 heard this, and I teased her, "Yes, I have a M. eye and I can see you even if I am not looking." I told her it grows when Moms are pregnant and she can't see it because it would look funny to have an eye sticking out from my hair. To my surprise she totally bought it for months. I felt sort of bad about it but it was funny.
Likewise, we have teased our kids that they had tails when they were born, but they fall off when they are babies like the umbilical cord stump does. I even showed my daughter her "tail" on her sonogram. However, they tend not to believe this one so easily. But it makes them wonder.