Lenticular Clouds

https://www.google.com/search?q=flying+saucer+clouds&client=browser-rockmelt&hs=pNX&channel=omnibox&tbm=isch&tbo=u&source=univ&sa=X&ei=2Sa1UfeLLIe5igKvp4D4CQ&sqi=2&ved=0CDgQsAQ&biw=972&bih=493

Nice, huh?