“Why did the vampire flunk art class?”/“He could only draw blood.”

A vampire riddle is:
 
Q: Why did the vampire (Dracula) flunk art class?
A: He could only draw blood.
 
The joke has been cited in print since at least 1997.
 
 
Google Books
World’s Silliest Jokes
By Philip Yates and Matt Rissinger;
Illustrated by Jeff Sinclair
New York, NY: Sterling Publishing
1997
Pg. 45:
HOMER: Why did the vampire flunk out of art class?
GOMER: Because he could only draw blood.
 
Google Books
Best Halloween Jokes
By Melvin Berger
New York, NY: Scholastic Inc.
2001
Pg. 26:
Why did the vampire fail art class?
She could only draw blood!
   
Google Groups: alt.humor.puns
Puns of the Weak 11/22/02
Stan Kegel
11/22/02
(...)
Why did Dracula flunk art class?
Because he could only draw blood!  (Julia, 11)
 
Google Groups: alt.humor.puns
Puns of the Weak 03-28-03
Stan Kegel
3/28/03
(...)
Why did Dracula flunk art class?
Because he could only draw blood! (Julia, Age 11)
 
Twitter
This Guy
‏@imperiumrex9
Why did Dracula flunk art class? He could only draw blood!
5:20 PM - 7 Dec 2009
 
Twitter
Daily Groaner
‏@DailyGroaner
Q: Why did #Dracula flunk #art class? A: Because he could only draw blood! #jokes #humor #funny
3:39 PM - 21 Apr 2010
 
Twitter
Ken Maness
‏@KenManess
@ChloeGMoretz Why was the vampire kicked out of art school? He could only draw blood.
11:20 AM - 1 Oct 2010
 
Google Books
Scooby-Doo’s Laugh-Out-Loud Jokes!
By Michael Dahl
North Mankato, MN: Capstone Young Readers
2016
Pg. ?:
Why did the vampire flunk out of art class?
She could only draw blood!