Labour leader Jeremy Corbyn has likened Theresa May to the comedy character Baldrick over her approach to Brexit negotiations, telling MPs her "cunning plan is to have no plan".
He said the prime minister's position owed less to "great philosophers" than the hapless sidekick from the 1980s BBC TV show Blackadder.
Mrs May noted Sir Tony Robinson, who played Baldrick, was a Labour member.
Sir Tony later described the pair as "a beardy man and a grumpy lady".
During Prime Minister's Questions, Mr Corbyn and Mrs May argued over the government's yet-to-be-announced stance for when negotiations for leaving the European Union begin next year.
Corbyn really is getting rather good at Prime Minister's Question Time. He seems much better matched against May than he was against Cameron. Theresa May's response to the Baldrick jibe was really lame; she just doesn't do funny.