Miss Poppy points out that the Catholics have a long tradition of irrational violence when it comes to the eucharist:
Between the years of 1243 and 1761 thousands of Jews were tortured and executed for the crime of host desecration. Most were burned, many were mutilated. In 1370 almost every Belgian Jew was massacred, man, woman and child, for the crime of host nailing.
(Via Jesus’ General.)