Question: What day did the company that built The Rattler unveil its most popular ride?

Context paragraphs:
Timber Mountain Log Ride: The Timber Mountain Log Ride is a log flume water ride at Knott's Berry Farm in Buena Park, California, United States.  The ride is one of the oldest log flumes in the United States and is the most popular ride at Knott's Berry Farm.  The ride is one of the few log flumes that is themed in the world.

The Whip (ride): The Whip was a ride originally designed and built by W.F. Mangels Company of Coney Island, New York, United States.  William F. Mangels patented the ride in 1914 and it soon became an extremely popular ride.

Reese's Xtreme Cup Challenge: Reese's Xtreme Cup Challenge (RXCC) is a current attraction which was installed in 2006 at Hersheypark, where it became the first competitive, interactive dark ride.  It was built by Sally Corporation, a popular dark ride manufacturer.  The ride experience theme is sports, and the building exterior is themed on the Hersheypark Arena which is directly behind, outside Hersheypark.  This ride is not to be confused with the free Hershey's Chocolate World tour ride.  The ride replaced a building which housed the park's first aid and ride department offices, as well as a practice skating rink.

Rockin' Tug: Rockin' Tug is a flat ride manufactured by Zamperla.  The ride is manufactured in both traveling and park versions.  It is the first of a line of new "halfpiperides".  Zamperla's Disk-O is another popular ride from that "family".  The difference is that the Tug has a friction wheel, while the Disk-O is powered driven.

Pretzel Amusement Ride Company: The Pretzel Amusement Ride Company was a famous manufacturer of pretzel dark rides. Pretzel built over 1400 pretzel rides and sold them to carnivals and parks.  The pretzel ride was invented by Marvin Rempfer.  Leon Cassidy was Marvin's partner in the Pretzel Amusement Ride Company.  Both names are on the patent.  Leon Cassidy patented the single-rail dark ride in 1928 along with Marvin Rempfer.  The company originated in Tumbling Dam Park on the banks of Sunset Lake in Bridgeton, New Jersey.  A rider said that ""It felt like I was turned and twisted like a Pretzel"", so the name Pretzel was chosen.  A large heavy pretzel design was originally affixed to the front of each car to prevent the car from flipping backwards.  In 1929, a standard Pretzel ride had five cars, 350 feet of track, and was one and a half minutes per ride.  A pretzel ride sold for $1,200.

Beast (Alton Towers): Alton Beast (later known as New Beast) was a roller coaster at Alton Towers.  It first opened in 1988 in the Talbot Street (now Cloud Cuckoo Land) section of the park with the "Alton Mouse", a second-hand wild mouse coaster, and was marketed by the park as the largest coaster in the UK.  It was a very popular ride, and it stayed in Talbot Street until 1992, when it was moved to Thunder Valley near the "Thunder Looper" (where the Rollercoaster Restaurant is now) and renamed the "New Beast".  In 1994, "Nemesis" opened and the area was changed into Forbidden Valley.  The "New Beast" stayed in Forbidden Valley until the end of 1997, when it was removed to make way for "Air", the park's 2002 flying coaster.It was later removed in 1999.  It was sent to Divertido in Mexico City as Space Mountain.  It was removed when the park closed in 2004.  In 2010, the Beast was reopened in Salitre Magico as the Tornado.

Son of Beast: Son of Beast was a record-breaking wooden roller coaster located at Kings Island in Mason, Ohio.  Built and designed by the now defunct Roller Coaster Corporation of America, it opened to the public on May 26, 2000, and was themed as a sequel to one of the park's other signature attractions, The Beast.  In addition to breaking the world record for speed, Son of Beast was the first wooden hypercoaster in the world with a 214 ft drop and was the second wooden coaster to feature an inversion; Flip Flap Railway was the first, but was long defunct before the ride's opening.

Kentucky Rumbler: Kentucky Rumbler is a wooden roller coaster at Beech Bend Park in Warren County, Kentucky.  It has a drop of 80 feet and a height of 96 feet.  The ride was a significant addition to Beech Bend Park because before the Kentucky Rumbler was built, the park didn't have a signature unique ride, and even today it is still the most popular ride in the park.

Texas Star: Texas Star is a Ferris wheel at Fair Park in Dallas, Texas, where it operates during the annual State Fair of Texas and is the most popular ride.

Roller Coaster Corporation of America: Roller Coaster Corporation of America (abbreviated RCCA) is an amusement ride manufacturer based in the United States.  The company's first major project was the Rattler at Six Flags Fiesta Texas in 1992, while their most famous coaster was the Son of Beast at Kings Island, the world's tallest and first looping wooden coaster when it opened in 2000.

Supporting paragraphs: Roller Coaster Corporation of America Son of Beast
Answer: May 26, 2000