This is cool... Earth lasers seen from the moon
From a link posted by LJK:
The Surveyor photograph of the partially sunlit Earth [top left], is described by C. O. ALLEY, of the University of Maryland: "Surveyor VII's TV camera detected as starlike images two narrow laser beams sent to the Moon from, respectively, the Kitt Peak National Observatory, near Tucson, Ariz., and the Table Mountain Observatory, near Los Angeles.
"The blue-green argon-ion laser beams seen within the white circle on the photograph each contained only about I watt of power," Alley explained, "but appeared somewhat brighter than the brightest star, Sirius.
http://history.nasa.gov/SP-168/section2a.htm#64