Elmo Says Boo!

Elmo Says BOO is a 1997 Sesame Street directtovideo special celebrating Halloween. Elmo visits The Counts castle to tell him funny scary jokes. Classic Sesame Street segments are separated with new joke segments set in the castles exterior, featuring one Sesame Street character and a child, and interior, featuring the Count, Elmo, and some combination of the Bats, the Skeleton, the Ghost, a painting of the Groana Lisa, a suit of armor and the Counts pipe organ.

Source: Wikipedia