The slowly boiled frogs.

https://westcountrybylines.co.uk/brexit-is-the-uks-tulip-mania/

The Brexit Boiled Frog Temperature Timescale:

5°: “Better off out” (Nigel Farage and assorted Brexiters, pre-23 June 2016)

10°: “We hold all the cards” (Michael Gove, 9 April 2016)

15°: “British people will still be able to go and work in the EU; to live; to travel; to study..

20°: “No downside to Brexit, only a considerable upside” (David Davis, 10 October 2016)

25°: “Exact same benefits” (David Davis, 24 January 2017)

30°: “A little worse off” (David Davis, 30 March 2017)

35°: “Dunkirk Spirit” (Allison Pearson, 1 August 2017)

40°: “It won’t be Mad Max” (David Davis, 19 February 2018)

45°: “Fifty years before benefits” (Jacob Rees-Mogg, 21 July 2018)

50°: “Adequate food” (Dominic Raab, 24 July 2018)

55°: “Could not guarantee that people would not die as a result of a “no deal” arrangement” (Matt Hancock to Cabinet, 15 November 2018)

60°: “Poorer for 30 years” (Lucy Harris, future Brexit Party MEP, 18 May 2019)

65°: “Yellowhammer” – WW2-level deprivation and disruption (government leak to The Times, 18 August 2019)

70°: “No deal would be damaging” (Michael Gove to NFU, 7 February 2019)

75°: “Odds of no-deal are a million-to-one against” (Boris Johnson, 26 June 2019)