Apparently there's a Mo's (short for Moses's) Scale of Frightening, and a "scary" letter sent to a number of synagogues in Montreal and Toronto is said to register near the top.
Me? I don't get frightened by such things (which are created precisely to get the sort of rise out of people that has been reported--so mission accomplished, unidentified Jew-hater!). On the Mo's scale, the sight of, say, seething Zion-loathers hoisting Hezbo flags and spewing hate with complete impunity on the grounds of the Ontario legislature, part of the Grandiose Ayatollah's annual eliminationistpalooza, is a lot more frightening. (I'd give it a 9.)