Heck, they may even reoccupy the Rhineland. From Haaretz, with thanks to Misty:
A senior Iranian official threatened that Tehran may forcibly prevent oil export via the Straits of Hormuz if the UN imposed economic sanctions due to Iran's nuclear program, an Iranian news Web site said on Monday.
This is the first time an Iranian official makes military threats in a public statement on Tehran's recent disagreements with the West.
The news site, affiliated with the radical student movement in which President Mahmoud Ahmadinejad was once a member, quoted Mohammed-Nabi Rudaki, deputy chairman of the Iranian parliament's National Security and Foreign Policy Commission.
According to the report, Rudaki said that "if Europe does not act wisely with the Iranian nuclear portfolio and it is referred to the UN Security Council and economic or air travel restrictions are imposed unjustly, we have the power to halt oil supply to the last drop from the shores of the Persian Gulf via the Straits of Hormuz."