Students stack chairs to make the leaning tower of Pisa?

Hello.
I am trying to find out what movie a particular scene comes from.
I think it is from Carry On Teacher, but I am not sure. Maybe a different Carry On film, maybe something else entirely?
As an experiment in a class about gravity, a group of students (mostly of entirely boys) stack up chairs to create a simulation of the leaning tower of Pisa. The teacher sits on top. And then of course the whole thing falls over.
Is this from Carry On Teacher? If not, does anyone know what film it is from?