The fertile mind of Justice Stephen Breyer has conjured a stream of hypothetical questions through the years that have, in the words of a colleague, “befuddled” lawyers and justices alike.

Breyer, 83, seemed a bit subdued as he sat through the last of more than 2,000 arguments Wednesday in which he has taken part during 28 years on the high court. His wife, Joanna, also was in the courtroom.

But at the end of the case about Oklahoma’s authority to prosecute people accused of crimes on Native American lands, an emotional Chief Justice John Roberts paid tribute to Breyer for his prowess during arguments.

“For 28 years, this has been his arena for remarks profound and moving, questions challenging and insightful, and hypotheticals downright silly,” Roberts said.

A day earlier, Breyer provided only the most recent example, inventing a prison inmate named John the Tigerman in a case involving transporting an inmate for a medical test. Breyer called him “the most dangerous prisoner they have ever discovered.”

Just since Breyer announced in late January that he was retiring, he has asked lawyers to answer questions involving spiders, muskrats and “4-foot-long cigars smoked through hookahs” — none of which, it’s fair to say, had any actual links to the cases at hand.

Breyer once granted an interview to The Associated Press in which he acknowledged that his questions sometimes stretch the bounds of credulity.