If by any chance you forgot that today is the craziest day of the year, you'll be reminded as soon as you open Google's homepage, where a jolly, animated Doodle is doing a disco dance.
Further down on the page Google also offers a reminder of how we searched in 2013 with its annual Zeitgeist page, launched a few weeks ago.
See also: Top 10 Google Search Trends in 2013, According to Google
Google has been incredibly active when it comes to Doodles this year; we've seen the regular Google logo so rarely we've almost forgotten what it looks like. Some of the best from last year were a huge interactive Doodle celebrating the first parachute jump, an epic 'Doctor Who' game and an interactive crossword puzzle.
Check out some of Google's greatest animated Doodles below.
Each package gets larger with a mouse-over, and a click on it returns search results pertinent to a specific country or the particular items featured in a scene. This one is from December 24, 2010.
The Google Doodle team stars in an homage to the silent film era's greatest star's 122nd birthday, April 15, 2011.
This one's done in HTML5 and was published Sept. 7, 2010. To get the full effect, here's one you can interact with.
This Doodle commemorated John Lennon's 70th birthday in October 2010.
Debuting May 10, 2011, this Google Doodle marks dance choreographer Martha Graham's birthday.
Commemorated the birthday of the inventor of the Bunsen burner, German chemist Robert Bunsen on March 31, 2011.
The great inventor's birthday was honored on February 11, 2011.
Marking Independence Day 2010.
A real crowd pleaser was this playable Pac-Man game, which appeared on May 21. 2010. Here's a playable version.
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Image: Google