Katy and I went to Leics last weekend to go wash the car and generally annoy her folks. On the way back, we caught a patch of rain; at the edge of which there were rainbows. I'd never seen before a rainbow where you could actually see both ends of the arc. My camera didn't have a wide enough lens to be able to capture it, but it was beautiful.
Oh, and if the pictures seem a bit blurry, they were taken while we were going about 70 on the M11 :)
More here: http://www.flubu.com/various_pics/rainbows_may_2007/