That actually reminded me of a bug I submitted a while ago. It appears to be fixed now, but I was pretty surprised at the answer they provided at the time. When instant search first came out, anything that auto-completed to "do a barrel roll" would initiate the animation. It's such a popular term that simply typing "Do a" was enough to trigger it as it was the first result.

https://productforums.google.com/forum/#!topic/websearch/R5A...