whose severed head would cause you to blow people up?

Read this article about a cancelled Mozart (he wrote the music) opera production in Berlin. One of the scenes in the opera - Idomeneo - features the presentation of the severed heads of Jesus, Muhammed, Poseidon, and the Buddha. It is of note that this scene is a departure from the libretto.

Now consider:

Deutsche Oper said "incalculable" security risks would be posed by staging Idomeneo.

"We know the consequences of the conflict over the (Muhammad) caricatures," the opera company said in a statement. "We believe that needs to be taken very seriously and hope for your support."

The concern isn't about Christians becoming suicide bombers over this controversial scene. The concern is about the presentation of Muhammed's severed head and how certain people might respond to that, especially in light of the drama over the Pope's recent statements.