"What happens?" joke

A teacher dies and goes to Heaven. When she gets there, she meets
Peter at the pearly white gates.
Peter says to her, "Welcome to Heaven. Let me give you an orientation first."
So, Peter takes her to some beautiful mansions. The teacher asks,
"Who lives here in these beautiful houses?"
These are for doctors. They did a lot of good on Earth so they get a
nice mansion," replied Peter. Peter takes the teacher to some more
mansions. These were more magnificent than the first.
"Wow, who lives here?"
These mansions are for social workers. They did a lot of good on
Earth but didn't make a lot of money so they get a better house."
Peter took the teacher to some more mansions. These were the most
gorgeous homes she had ever seen. They had huge columns,
well-manicured lawns, beautiful stained glass windows; the works!
"These are the most beautiful homes I have ever seen," exclaimed the
teacher, "who lives here?!"
"Teachers live here." said Peter, "They did much good on Earth and
received very little money so they get the best houses in all of
Heaven."
"But where are all of the teachers?" inquired the teacher.
Peter answered, "Oh, they'll be back soon. They're all in Hell at an
in-service."