plaid screen
[XEROX PARC] n. A `special effect' which occurs
when certain kinds of
memory smashes overwrite the control
blocks or image memory of a bit-mapped display. The term "salt &
pepper" may refer to a different pattern of similar origin.
Though the term as coined at PARC refers to the result of an error,
some of the
X demos induce plaid-screen effects deliberately
as a
display hack.