They go off on tangents.
I don't know you tell me.
Don't worry, they'll tell you
Maths teachers, they make everybody count.
Mr. Bus (think about it)
You need to give a three hour lecture and turn in a research paper on "What is 'good' " first.
I know plenty of raunchy jokes, but was asked this recently and came up blank
Geometry.
Geometry
Beacuse you might have secant thoughts and go off on a tangent
A tangent.