Answer: China
On 1 April 2013, former Google China head Kai-fu Lee joked that the Great Firewall, China's infamous internet regulations and censorship, was penetrable, allowing access to Facebook and Twitter. His prank drew over 10,000 comments, many of which were filled with insults or other forms of anger.

Answer: 12:00 PM
All joking and hoaxing are to stop by 12:00 pm on 1 April. If not, in some countries the person pulling the prank is rather seen as a fool than the person tricked by it.

Answer: Roseanne
The hit 1990's sitcom Roseanne aired such an episode on 10 April 1990 which actually centered on the family scrambling to file their taxes on time.

Answer: New York City
The April Fool's Day Parade, founded by famous prankster Joey Skaggs in 1986, is now organized annually by the New York April Fools' Committee.

Answer: Fool's Errand
A fool's errand is a common April Fool's Day prank, such as sending a person to search for something that doesn't exist.

Answer: Gmail
Gmail was launched on 1 April 2004. At that time, many people thought it was a hoax for a webmail service to offer a whole gigabyte of free storage.

Answer: Tsunami
This disaster, which resulted in the death of over 160 people, has been dubbed the April Fools Day Tsunami due to some in Hawaii believing that initial warnings of such were a hoax.

Answer: Burger King
Burger King released an ad for the fictitious "Left-Handed Whopper" on April Fool's Day of 1998, upon which reportedly thousands of customers went to their stores requesting the sandwich.

Answer: Hilaria
Hilaria was held shortly before 1 April during the March equinox and as the name implies featured a lot of joking and merriment.

Answer: Fish
April Fool's Day is referred to as April Fish Day, with jokes and pranks usually being centered on, as you may have guessed, fish.