Explore the fiery chaos of the Elmo on fire meme! Discover the bizarre origins and meaning of Hellmo, the infamous Elmo burning meme.

Elmo's birthday is Feb. 3; he will be 3.5 years old. Find out the ages of Elmo, Big Bird, Grover, Snuffleupagus, Cookie Monster and everyone on Sesame Street.

Elmo is baffled by the millions of responses he's getting from this rather run-of-the-mill tweet he posted: "Elmo is just checking in! How is everybody doing?" ...