The idiom to “stick out like a sore thumb” (to be very obvious) is sometimes expressed using the spoonerism “Thor sum.”
       
“‘He sticks out like a Thor sum’ - @adamdsain” was posted on Twitter by Jesse Baker on January 2, 2011. “Third grade arithmetic was hard for the Norse god.  He stuck out like a Thor sum” was posted on Twitter by Mark D on May 23, 2011. “If you do your maths homework in Viking runes, it’ll stick out like a Thor sum” was posted on Twitter by Drew Weir on June 14, 2011. “Norse gods are really bad at maths. I’m going through Valhala’s accounts and some errors stick out like a Thor sum” was posted on Twitter by Joe West on August 8, 2012.
   
“Norse God mathematicians stick out like Thor sums” was posted on Twitter by Steven Brake on November 30, 2020, and on Twitter by The Dad Joke Man on December 6, 2020.
   
     
Twitter
Jesse Baker
@Jesse_Baker
“He sticks out like a Thor sum” - @adamdsain
2:23 AM · Jan 2, 2011·twidroyd (original)
       
Twitter
Mark D
@northpacific
Third grade arithmetic was hard for the Norse god.  He stuck out like a Thor sum.
3:43 PM · May 23, 2011·Twitter for iPhone
 
Twitter
Drew Weir
@Droooo
If you do your maths homework in Viking runes, it’ll stick out like a Thor sum.
4:19 AM · Jun 14, 2011·Twitter Web Client
   
Twitter
Joe West
@joejwest
Norse gods are really bad at maths. I’m going through Valhala’s accounts and some errors stick out like a Thor sum.
5:46 AM · Aug 8, 2012·Twitter Web Client
   
Twitter
Mark Vincent
@mraynervincent
At school I wore a Viking helmet to maths lessons. I stuck out like a Thor sum.
3:40 AM · Feb 19, 2013·Twitter Web Client
 
Twitter 
Weston David Pagano
@westonpagano
The addition of Norse gods sticks out like a Thor sum. #Puns #Punny #IWinTwitter
1:18 PM · Apr 16, 2013·Twitter SMS
   
Twitter
denver dalley
@denverdalley
Sticks out like a Thor sum.
1:13 AM · May 4, 2013·Twitter for iPhone
     
Twitter
Julian Lee
@JulianLeeComedy
At the last comic con everyone noticed me adding up Norse God superheroes. I stood out like a Thor sum.
Which is why I was Loki at this one
11:09 AM · Jun 6, 2014·Twitter for iPhone
 
Twitter
Michael Charboneau
@AiYume
The problem with Norse gods doing math is that it sticks out like a Thor sum.
8:57 AM · Sep 16, 2014 from San Leandro, CA·Twitter for iPhone
     
Twitter
Malcolm Nygard
@MalcolmNygard
The God of Thunder just got his report card back. Mostly A’s, but his Math grade stood out like a Thor sum.
5:30 PM · Jun 27, 2016·Twitter for iPhone
   
Twitter
Glyn Sexton
@glynster61
One superhero is notorious for glaring mathematical errors. His mistakes stand out like a Thor sum.
#1PUN
8:00 AM · Nov 23, 2017·Twitter for Android
   
Twitter
Daniel Edison
@DanEdisonComedy
I went to a fancy dress party as the God of Thunder, holding a calculator.
I stuck out like a Thor sum.
2:22 PM · May 31, 2018·Buffer

Twitter
Davieo
@GoddessOCosplay
I tried to say “sticks out like a sore thumb” and instead I said “sticks out like a Thor sum”
Then when I tried to repeat myself to correct myself, I said “thicks” instead of “sticks”
12:22 AM · Jul 9, 2019·Twitter for Android
   
Twitter
Lochlan Sudarshan
@Lochlan_S
Replying to
@noelrap
(INT. FALAFEL SHOP AFTER “AVENGERS”)
Steve: Wow, that bill’s high
Tony: Don’t worry I got it. Jeez, that is high. Is this a typo? Mine’s $8, Yours is $10
Thor: (double fisting falafels) Is there a problem, friends?
Tony: (reading bill) I see it now. Sticks out like a Thor sum
1:34 AM · Jul 18, 2019·Twitter Web Client
 
Twitter
Steven Brake
@quip_witted
Norse God mathematicians stick out like Thor sums.
#puns
1:33 PM · Nov 30, 2020·Twitter for Android
   
Twitter
The Dad Joke Man
@DadJokeMan
Norse God mathematicians stick out like Thor sums…
10:02 AM · Dec 6, 2020·Twitter for iPhone