"Combustion" is the twelfth and final episode of the C Series of QI and the 36th episode overall. It was first broadcast on BBC Two on 16 December 2005. It featured no new panellists. The episode was preceded by "Carnival" and followed by "Danger".


Numbers in brackets mark appearances - e.g. "(2)" means "(second appearance)".

  1. Bill Bailey (11): 3 points
  2. Dara Ó Briain (2): -8 points
  3. Phill Jupitus (7): -18 points
  4. Alan Davies (36): -47 points


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  • The greatest raid made by the Allies' Mosquitoes, was when they sent 12 aircraft to rescue 12 members of the French Resistance in the attack on Amiens Prison.
  • The crew of the RMS Titanic had their wages stopped as soon as the ship started sinking.[1]
  • The difference between an Able Seaman and an Ordinary Seaman is that the able seaman has to have a log known as a "certificate of continuous discharge".
  • Pistachios and walnuts could destroy the hull of a ship, because they are Spontaneously combustible.
  • Peanuts, almonds, pistachios, Brazil nuts, cashews, coconuts, horse-chestnuts, pine nuts and beetle nuts are not nuts, most of them are seeds.
  • Examples of true nuts are walnuts, butternuts, hickory, pecan, wingnuts, chestnut, beech, oak, stone oak, tanoak, hazelnuts, filbert and hornbeam.
  • Rolls-Royce test their aircraft engines for the effects of bird strike with chickens fired from a cannon.
  • The inventor of the theory of relativity was Galileo and it was known as the Galilean invariance.[2]
  • Three-quarters of the people accused of witchcraft in England were acquitted.[3] Fry described The Da Vinci Code as "loose stoolwater" and "arse-gravy of the worst kind".

General IgnoranceEdit

  • Pine is a technical example of a softwood.[4]
  • If you cut an earthworm in two, it becomes two halves of a dead worm.[5]
  • Instead of using a Space Pen, astronauts could have used a regular pen in zero gravity.[6]
  • Doubt Card (Bollocks Answer): Neil Armstrong and the Mr Gorski story – told as a fact but then shown to be the fictional answer. Alan correctly used his doubt card for this.
  • The triple point of water is 0.01 °C; in "Biscuits", Dara Ó Briain incorrectly stated that it was 0 °C.[7]


Everyone was given a "doubt card" to play when they thought the answer to a question Fry stated was incorrect. Davies correctly invoked this in response to an answer involving Neil Armstrong.


  1. They drowned
  2. Einstein
  3. They were burned
  4. Balsa wood
  5. You get two worms
  6. A pencil
  7. 0 °C - Dara Ó Briain
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