This paper explores spontaneous humour-linked phenomena in TV documentary, asserting that their presence helps to overcome the scripted nature of the genre. Centering on the diegetic level of interaction between the presenter and other individuals present in the scene, the assay traces how the interlocutors attain mutual in-tune-ness that is required for setting up the play frame. It pays attention to several humour-linked phenomena, covering non-humorous laughter, joint joking and physical pranks. The findings point out that while laughter can ease tension associated with face-threat or personal failure, other forms of humour appear in the diegetic frame as part of the programme producers’ design to distract from the transactional mode of factual television to a more entertaining hybrid format based on a notable experiential component. As a result, TV viewers do not simply receive information but deduce pleasure from the playful spontaneity executed for their benefit by the presenter and other interlocutors.