A riddle about Rudolph the Red-Nosed Reindeer is:
 
Q: Why didn’t Rudolph get a good report card?
A: Because he went down in History.
 
The joke is based on the last lyrics to the “Rudolph the Red-Nosed Reindeer” song:
 
“Then how the reindeer loved him
As they shouted out with glee (yippee)
‘Rudolph, the red-nosed reindeer
you’ll go down in history!’”
 
“Why did Rudolph the Red-Nosed Reindeer never graduate from high school? Because he went down in history” was printed in The Globe and Mail (Toronto, ON) on December 16, 1997. The Rudolph report card joke has been printed on an image.
 
   
Wikipedia: Rudolph the Red-Nosed Reindeer
Rudolph the Red-Nosed Reindeer, popularly known as “Santa’s ninth reindeer,” is a fabled reindeer created by Robert Lewis May. Rudolph is usually depicted as the lead reindeer pulling Santa’s sleigh on Christmas Eve, though he is a young buck who has only adolescent antlers and a glowing red nose. Though he receives scrutiny for it, the luminosity of his nose is so great that it illuminates the team’s path through harsh winter weather.
 
Rudolph first appeared in a 1939 booklet written by Robert L. May and published by Montgomery Ward, the department store.
 
The story is owned by The Rudolph Company, LP and has been adapted in numerous forms including a popular song, the iconic 1964 television special and sequels, and a feature film and sequel. Character Arts, LLC manages the licensing for the Rudolph Company, LP.
 
Wikipedia: Rudolph the Red-Nosed Reindeer (song)
“Rudolph, the Red-Nosed Reindeer” is a song written by Johnny Marks based on the 1939 story Rudolph the Red-Nosed Reindeer published by the Montgomery Ward Company. Gene Autry’s recording hit No. 1 on the U.S. charts the week of Christmas 1949.
         
16 December 1997, The Globe and Mail (Toronto, ON), “Your Morning Smile,” pg. A1:
Why did Rudolph the Red-Nosed Reindeer never graduate from high school? Because he went down in history.
   
Google Groups: alt.humor.puns
Puns of the Weak: 12/21/01
Stan Kegel
12/21/01
(...)
Why did Rudolph get grounded after his dad saw his report card?
Because he went down in history! (Bill Rayborn)
 
Twitter 
emily‏
@goodnessgracias
Replying to @TomFelton
@TomFelton christmas joke: why did Rudolph get suspended from school? he went down in history!
5:25 PM - 24 Dec 2009
 
Twitter
emily‏
@goodnessgracias
Replying to @larouxofficial
@larouxofficial why did rudolph get expelled from school? he went down in history
12:15 PM - 6 Jun 2010
     
Twitter
Trent‏
@Meow_ImA_Llama
Why did Rudolph have to repeat 7th grade?... He went down in history.
5:59 PM - 24 Dec 2012
   
Twitter
Daniel Martinez‏
@CapitanDMart
Why did Rudolph the Red-Nosed Reindeer never get a degree in ancient cultures?
His grades went down in history.
#December
#LeTitsNow
1:31 PM - 1 Dec 2014
 
Reddit—Puns
Rudolph’s report card (i.imgur.com)
submitted December 2, 2014 by willybusmc
COMMENTS
theslacktastic
Because “he’ll go down in history” 🎶
   
Twitter
David Charles Abell‏
@DCA_Conductor
@ThePhillyPops
Why was Rudolph upset when he saw his report card?
Because he went down in history.
10:30 AM - 14 Dec 2014
 
Twitter
Dr. John Rindy‏
@baldcareerguy
as finals approach, just remember, even Rudolph went down in history!!
7:20 AM - 1 Dec 2017
 
PopSugar
25 Holiday Jokes That Will Make Your Kids Belly-Laugh Like Santa
December 6, 2017 by DANA ZEPEDA
(...)
25. “Why didn’t Rudolph get a good report card?” Answer: “Because he went down in History.”