:P Purim starts at sundown, so the bulk of it actually falls on Good Friday. Basically it was just "Note the interesting dissonance." Good Friday is the crucifixion, so Maundy Thursday service includes reading of the events leading up to that (http://bible.gospelcom.net/passage/?search=Matthew%2026;&version=31;) -- the betrayals, the Last Supper, etc. Most solemn and grave service of the Christian calendar save Good Friday itself.