The USPS has released a promotional video featuring Spiderman (with a cameo by his creator, legendary cartoonist Stan Lee). to promote priority mail:
The U.S. Postal Service® and Spider-Man are two timeless and powerful heroes with similar characteristics; Speed, Agility, and Reliability. USPS is dependable and consistently delivers. Spider-Man is exceptional and there when needed most. Together they continue to go to great lengths to deliver for you, no matter what.