My own mnemoniac is my pal Andy to whom I ply with cheap wine and flatteries but alas he is oft times gone and so I many times resort to the more traditional. For example, the code to the security alarm at the warehouse is 1492, so mnemonically I inverted the two middle numbers to read 1942, -get it- thats the year that we, the Americans of the world, first split the atom. Pretty neat, huh?