philter \FIL-tur\, noun:
Some things you can feel coming. You don't fall in love because you fall in love; you fall in love because of the need, desperate, to fall in love. When you feel that need, you have to watch your step; like having drunk a philter, the kind that makes you fall in love with the first thing you meet. It could be a duck-billed platypus.
-- Umberto Eco.