According to Wikipedia
“Rabbit rabbit white rabbit” is a common British superstition. The most common modern version states that a person should say “rabbit, rabbit, white rabbit” or simply “rabbit, rabbit, rabbit” upon waking on the first day of each new month, and on doing so will receive good luck for the duration of that month.
Being the first to say "rabbit rabbit" to a person on the first of the month will bring good luck. Once someone says "rabbit rabbit" to you, you are no longer allowed to repeat it to anyone, thus having bad luck for the next month.
This challenge could take you as long as a year or as short as a few days. In fact, you may qualify right now and not even know it. You may use this cache for your last month. There is no need to wait until the day after your 12th top o' the month cache.
To certify you have completed the challenge, please post the 12 cache's GC# that you have found on the first of the each month in your online log.
Congrats to vortexecho and _c3_ for the co-FTF! As VE noted, you never know if you might qualify! Check today, and good luck!