In the US, can attaching a condition to a threat have any bearing on whether it's a true threat or not? In other words, is there are difference between the following threats, in terms of criminal law:

* I'll hit you! (unconditional)
* If you speak to me again, I'll hit you! (conditioned on something that the other person is perfectly entitled to do)
* If you try to steal my car, I'll hit you! (conditioned on the other person's *criminal* behavior)
* If you violate the 2nd law of thermodynamics, I'll hit you! (conditioned on something impossible)