robin williams gave us iconic moments so many still treasure. first, that memorable catchphrase -- >> nanu-nanu. >> reporter: nanu-nanu from "mork & mindy." today, this handwritten sign at mork's tv home, you will be missed. how about the iconic wake-up call from 1987's "good morning, vietnam." >> good morning, vietnam! >> reporter: williams then carried it around the world! >> good morning -- >> good morning, virginia! >> good morning, baghdad! >> reporter: and even sent it up to space. >> good morning, "discovery!" >> reporter: "dead poet's society" would offer this scene and inspiration and later youthful defiance. >> i stand upon my desk to remind myself that we must constantly look at things in a different way. >> reporter: and fans around the world doing it too. posting these images. in his memory.