Lex Credendi

A 33-year old man in Jensen Beach, Florida attempted to steal consecrated Hosts from a parish church during Communion, assaulting a priest and several parishioners in the process.

It is assumed by some that he intended to use the Hosts for some diabolical purpose; perhaps a Black Mass or something like that.  It should be noted that such a crime, if committed by a Catholic, incurs automatic excommunication that can only be lifted by the Pope himself (or presumably, a delegate).  Deliberate desecration of the Eucharist is the most serious crime in canon law, as it is an attempted assault on Jesus Christ Himself.

http://www.catholic.org/national/national_story.php?id=30514