This is just immense. I've heard this one before, but only just realised how much I love it. As has been mentioned, the fella deserves muchos credit for playing his part in what was a tremendous prank. It only takes Jack for a good call, but it takes two for a truly great call. Many hilarious moments but the ones that stand out are...
Jack saying "go on,I don't wanna break your rhythm" after a series of bizarre remarks
and his perfect intervention here...
"I gotta build up to climbing stairs, that sort of thing"
fella: "well what I can suggest is -
"climb a flight of stairs?" (chuckles)