After the most popular trick “Do a barrel roll“, Google has released another trick two days ago. Lets not keep it surprise, so try out searching “Let It Snow” in Google and wait for the pleasant gift.
You should see snowflakes falling on your browser and covering it slowly. For more surprise move your mouse and start clearing the snow. Click the “Defrost” button to start over again.
Also, checkout few more fun from Google:
Search Google gravity and click the first link!
Create graphs for complex maths functions in Google Search!