National Tickle Day in USA
National Tickle Day in USA is held on April 16. This event in the second decade of the month April is annual. 
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It is when u tickle people until they are rolling on the floor dying and don't get mad because it is just a joke...
Scientists are studying how animals respond to being tickled in a bid to find out how laughter evolved.
#TickleDay
Similar holidays and events, festivals and interesting facts
Rubber Eraser Day on April 15 (Joseph Priestley discovered the eraser in 1770, using pieces of rubber imported from Brazil. Then in 1858, Hyman Lipman of Philadelphia, Pa., patented the pencil with an eraser at the end);
Take A Wild Guess Day on April 15
Stoker's Day on April 15 (is celebrated in spring, at the end of the heating season. All shifts workers gether in the boiler room to extinguish the boilers and begin to celebrate. The date of this celebration is not fixed. The local authorities decide when to start and when to finish the heating season but usually it hapends not later than April 30 if the average air temperature is above +8 for 3 days in a raw);
Foursquare Day on April 16
Wear Your Pajamas To Work Day on April 16
Bat Appreciation Day on April 17
Blah Blah Blah Day on April 17 (is the opportunity to stop procrastinating and get to grips with all those stalled projects and broken promises right now);
Ford Mustang Day on April 17 (The Ford Mustang was first introduced to the world in April of 1964);
Haiku Poetry Day on April 17
Kickball Day on April 17
International Pizza Cake Day on April 17