Starmie

My tail bone still hurts.
Did I crack something?

My partner's in prison.
A prison.
Visiting a prison today.
Who wants to visit a prison?
He's taking the "tour" for some work-related reason
and they won't let him take in his cell phone.
Hope he gets out.

Meanwhile, my tail bone hurts.

And I must drive today
and teach a class I'm not prepared for
because I graded and graded and graded.

Can you use the word oscillation in a knock-knock joke?