Many people woke up this morning to a very different world.
Google announced today that it had finally conquered artificial intelligence, Travel Web site Expedia is now offering flights to Mars for $99 and after 188 years, London's Guardian newspaper has ditched its print edition and has switched to an all-Twitter version.
"Experts say any story can be told in 140 characters," the paper said.
The story detailing the change is much longer.
YouTube is also testing a brave new layout. Click on your video of choice and get ready to blink your eyes in disbelief. A number of YouTube videos are playing upside down. The site says it's part of an ongoing effort to "improve the way you watch videos online" and even suggests that you flip your monitor upside down, tilt your head to the side or, better yet, move to Australia.
But before you update your Facebook page to tell your friends about that upcoming trip to the red planet, you might want to check a calendar. This isn't just any old Wednesday. It's Wednesday April 1, more commonly known as April Fools' Day.
The interplanetary travel and the move to tweet journalism were just a couple examples of the practical jokes playing out on the traditional day of worldwide hoaxes.
In the holiday spirit, ABCNews.com invited our readers to submit their favorite April Fools' Day stories. Some are funny, some are bizarre and some are just downright mean. Don't worry, though. We won't pass judgment on you; we're just sharing some of our favorite tales. And here are some of our favorite responses:
We start with Janice from White Hall, Ark. A few years back, Janice thought it would be funny to send a little gift to her boyfriend at the time. Imagine the look on the guy's face when the small blue bear and the balloons reading "Congratulations on the New Son" arrived at his office.
"His co-workers thought it was so funny. He did not think so," Janice tells us.
This next tale should be a warning to all: Think twice today before you accept food from friends or co-workers. Brian from Phoenixville, Pa., decided one year to buy some Oreo cookies and remove the filling.
"That's the best part," he said.
He refilled the cookies with white baking soda toothpaste. Then on a hot day, when it looked like the icing might have melted, he shared his altered cookies. Probably not the best afternoon snack, but at least all of his friends had sparkling white teeth.
If you thought that was mean, consider the story from Mark, of Roanoke, Va.
One April 1, he woke up very early, stood on a chair in his house and lit a match under the smoke detector.
"When it went off, I yelled 'fire,' and my wife and three kids got up and ran out of the house in their pajamas," he wrote in an e-mail.
When they got to the front yard, Mark yelled out the window "April Fools' Day."
"I am still alive but have been locked up in my basement for the past 23 years! It was fun though," he wrote.
Last year, Sherry Inskeep of Westerville, Ohio, was just a few days short of having a baby. She was sitting in the living room watching TV with her two teenage children.