With Valentine's Day just around the corner (OK, two weeks away, but still), this is highly appropriate for all the days in February leading up to that day...all 13 days.

"...two people under the influence of the most violent, most insane, most delusive, and most transient of passions, who are required to swear that they will remain in that excited, abnormal, and exhausting condition continuously until death do them part.”
George Bernard Shaw