I saw a TRIPLE rainbow today.  The weather was unreal - bright sunshine to the east and colossal black rainclouds to the west.  I turned around and saw two rainbows, one on top of the other and when I looked closer you could even see another rainbow almost inside the largest one!  Snapped off dozens of pictures but when I came to review the dreaded "no card in camera" flashed up.... IDIOT! 

Grabbed the nearest one, went back outside and it was almost too late - managed to get this shot of the main rainbow, the much larger (albeit fainter) second rainbow had disappeared but you can still see the weird layering of rainbows beneath it.  Pretty cool :)

A reminder to myself - keep the batteries charged and the memory card INSIDE the camera!