Speaking on a subject probably makes it more complex, but reading your description I had a sudden memory of Timmy Mallett's word-association game, from the UK b

Speaking on a subject probably makes it more complex, but reading your description I had a sudden memory of Timmy Mallett's word-association game, from the UK back in the day. The aim there is to reply spontaneously to random words, without hesitation and repetition. If you fail you get hit on the head by a foam-mallet.