In the light of the gee-whiz, wow-factor, seamless integration of computer-generated graphics and photography in movies such as 'Avatar', I thought this trailer for the 1957 movie 'The Giant Claw' might amuse you. Note the state-of-the-art special effects for the era, which appear so chintzy today.
Things have improved since then - although if a 'giant bird from outer space' were to attack the United Nations building today, I daresay many of us would cheer it on! That might call for some script adaptation . . .