From an article appearing in Findlaw for Legal Professionals:
No one took any notice of the tall, slim man who appeared Tuesday for jury duty. Had he worn his black robe, Supreme Court Justice Stephen Breyer no doubt would have drawn more attention.
Even Marlborough, Mass., District Court Judge Thomas Sullivan Jr. didn’t recognize Breyer until he read the justice’s name on a document listing potential jurors for cases he was hearing.
“When I looked at the slip I said, ‘Oh, my God,'” Sullivan said in a telephone interview with The Associated Press.
Source: Stark County Law Library Blawg