According to old movies, you throw a virgin into it.
Hopefully, the Islamists will use Paris Hilton, causing their plan to fail miserably.
LOL! The volcano would spit her back out!
I thought they threw the virgin in to keep it from erupting. Maybe you are thinking of "Joe vs the Volcano" where two lovers willing jump in and the volcano erupts and blows them out.
I don't think it will work if Achmed and Mohammed jump in together. But the volcano could get insulted if someone convinced the Steisands that jumping into the volcano would make Reagan look bad.