There are, but wouldn't handing in your resignation make more sense than spending time in the Striped Sunlight Hotel (otherwise known as the federal pen)? Unauthorized access to a computer is a federal felony. Hacking around a block falls under FISA, and you could be tried as a terrorist. (I believe the prize for that is a lifetime vacation on the south coast of Cuba.)
The feds don't consider things like this to be a joke any more. If anyone in the company is looking for an excuse to get rid of you, you couldn't hand them a better one. (Or an easier one - one phone call to the local US Attorney's office is all it would take to make you an ex-employee.)