WASHINGTON, DC - JUNE 24: (L to R) Allen Kane, Director of the National Postal Museum, Chris Karpenko, Executive Director, Brand Marketing, United States Postal Service, and Sharon Cohen, Executive Vice President, Partnership Marketing, Nickelodeon, at the SpongeBob Mailbox induction ceremony at the Smithsonian National Postal Museum on June 24, 2016 in Washington, DC. (Photo by Paul Morigi/Getty Images for Nickelodeon)