A popular Halloween riddle about a ghost teacher is:
Q: What did the ghost teacher say to her class?
A: “Watch the board and I’ll go through it again!”
The riddle has been cited in print since at least 2003 (in a slightly different form) and 2006.
Google Groups: alt.sports.soccer.everton
Whoooooooooooo!
Quaggers
10/13/03
The teacher at the ghost academy was teaching his pupils how to pass right through a wall.
“Now did you all follow that?” asked the teacher.
“If not.................I’ll just go through it again!”
Google Groups: The Hallowe’en Party
Halloween Jokes
Nool...@aol.com
9/18/06
A ghost joke
What did the ghost teacher say to her class?
Watch the board and I’ll go through it again!
Twitter
Rob Lawrence
@keepasecret
What did the ghost teacher say to her class? Watch the board and I ‘ll go through it again! http://www.TheMidnightReport.com 
9:31 AM - 30 Mar 2009
Google Books
The Mammoth Book of Really Silly Jokes
By Geoff Tibballs
London: Constable & Robinson, Ltd
2011
Pg. 133:
What did the ghost teacher say to her class?
Watch the board and I’ll go through it again.
Google Books
Insults Anywhere Kids Presents
Joke Book Of The Living Dead
By Franklin Yantz
Published by Insults Anywhere at Smashwords
2011
Pg. ?:
What did the ghost teacher say to her class?
Watch the board and I’ll go through it again!
Google Books
101 Amazing Spooky Jokes
By Jack Goldstein
Andrews UK Limited
2013
Pg. ?:
What did the ghost teacher say to her class?
Watch the board and I’ll go through it again!
Twitter
Christian Fletcher
@Darth_Pingu
#HappyPunoween
Q: What did the ghost teacher say to their students?
A: “Watch the board, I’ll go through it again!”
4:31 PM - 29 Oct 2016
Above, a 1934 plaque from the Big Apple Night Club at West 135th Street and Seventh Avenue in Harlem. Discarded as trash in 2006. Now a Popeyes fast food restaurant on Google Maps.
Recent entries:
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Entry in progress—BP (5/31)
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Entry in progress—BP (5/31)
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“Today I’m having a vision problem. I can’t see myself doing anything at all” (5/31)
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Entry in progress—BP (5/31)
•
“Be the reason why someone has to take a break from social media” (5/31)
More new entries...
Above, Big Apple Corner at 54th Street and Broadway in Manhattan. Google Maps.
Above, John J. Fitz Gerald, from the Aug. 15, 1931, Binghamton (NY) Press, pg. 14.
Listen to Robert Emmerich introduce "The Big Apple," a hit song from 1937. Music written by Bob and performed by Tommy Dorsey's Clambake Seven with Bob on piano. Lyrics written by Buddy Bernier and sung by Edythe Wright. Audio provided by Dorothy Emmerich.
Also listen to a 1937 "The Big Apple" song by Ozzie Nelson and his Orchestra. See a 1929 photo of John J. Fitz Gerald and a 1931 photo of John J. Fitz Gerald.
This site is edited by Barry Popik.