In February, Google released a easter egg named blink HTML that made some of the words in the search results blink on the screen.
But as Enrico Altavilla noticed and posted on Google+, it also works on query refinements. So if you search for [blink html] first and then enter another query, it will go ahead and blink the other query.
Here is a quick link so you can see it in real time.
Pretty fun and with this, I bet you can drive people crazy. Let's say someone complains they are having eye trouble. You can send them to a search result for [eye problems] and have a blast with them. Have fun with this!
Forum discussion at Google+.