Gas in Class

As my two daughters
Progressed through school
They had many different teachers
And some were
More different than others.
There was one
Whom they both had
Who would face the board
And speak from the rear
And then turn around
And defensively say
“It is only natural!”
I suppose he was
More natural than most
And whether it was instinct
Or just plain out stink,
He used this talent
To entertain each daughter
For a solid year!