A slip of the tongue from Jeremy Corbyn during PMQs.

Jeremy Corbyn
01: erm
02: the mayor of London
03: also added this is causing unnecessary certainty
04: but it’s also very important
05:    ((chamber: laughter))
06: uncertainty (.) erm
07: mister speaker
...

External link to clip

PMQs, House of Commons, 26th October 2016