The Grateful Dead playing at Duke University in Durham, North Carolina on April 12, 1978. Keep an eye on Jerry, especially at the very end of the song. Truly amazing. I miss him still :-)

You can see other videos from the same show here:
http://www.youtube.com/results?search_query=04-12-1978&search=Search

You can listen to this entire show here:
http://www.archive.org/details/gd78-04-12.sbd.ashley-bertha.14085.sbeok.shnf