Colin Higgins signed photos.  Obtained through the mail.  He was who said "That's impossible, even for a computer".  Luke responds about bulls-eying womp rats back home....  This line, originally attributed to Denis Lawson (Wedge Antilles) and credited in the script to Wedge, but it's is really Colin Higgins.  We fans lovingly refer to him as the "Wrong Wedge". The photos are from the briefing room scenes in Star Wars: A New Hope