In 1997, Warner Bros. and the US Postal Service teamed up to produce a stamp featuring Bugs Bunny, to commemorate Bugs' iconic status and to encourage young stamp collectors. The stamp proved so successful that it rivalled the legendary Elvis Presley stamp in popularity, and spawned 3 follow-ups: Sylvester and Tweety, Daffy Duck, and Wile E. Coyote and Roadrunner. Here's a sheet of the Sylvester and Tweety stamp, released in 1998. Notice that stamps were cheaper then. By the time the Road Runner/Coyote stamp was released, the price was 33 cents. Stamps are now 41 cents. Ouch.