They know their limits.
Umm... I don't know... I've got nothing.
Pupil: Dead I didn't even know he was sick!
He works it out with a pencil.
The mathematician says "2" The Physicist says "2, plus or minus 0.1" The engineer says "Probably around 2, but let's say 3 to be on the safe side".
A shootout.
Take it to the limit. RIP Glenn Frey
2: 'Well, I think I can really push my limits' 1: 'Oh right, are you sure ' 2: 'I'm definite'.