“Scuba” is an acronym for “self-contained underwater breathing apparatus.” “Tuba” is not an acronym, but there are jokes.
   
“She got the SCUBA acronym correct, then smiled and said: ‘I know that because TUBA stands for “terrible underwater breathing apparatus’” was posted on Twitter by Kevin Hainline on February 21, 2011. “SCUBA: self-contained underwater breathing apparatus. TUBA: terrible underwater breathing apparatus” was posted on Twitter by Joe Thompson on January 23, 2013.
 
“SCUBA is an acronym for Self Contained Underwater Breathing Apparatus. What you may not know is that Tuba is also an acronym… For Terrible Underwater Breathing Apparatus” was posted on Reddit—Jokes on April 12, 2020.
   
     
Wikipedia: Tuba
The tuba (/ˈtjuːbə/; Italian: [ˈtuːba]) (bass) is the lowest-pitched musical instrument in the brass family. As with all brass instruments, the sound is produced by lip vibration into a large mouthpiece. It first appeared in the mid-19th century, making it one of the newer instruments in the modern orchestra and concert band. The tuba largely replaced the ophicleide. Tuba is Latin for “trumpet”.
 
Twitter
Kevin Hainline
@Kevin_Hainline
She got the SCUBA acronym correct, then smiled and said: “I know that because TUBA stands for “terrible underwater breathing apparatus.”
8:42 PM · Feb 21, 2011·Twitter Web Client
 
Twitter
Ian Plagmann
@pianostool
Tuba: terrible underwater breathing apparatus
10:27 AM · Jan 8, 2013·Twitter Web App
 
Twitter
Joe Thompson
@j03tHoMp50N
SCUBA: self-contained underwater breathing apparatus. TUBA: terrible underwater breathing apparatus.
11:05 AM · Jan 23, 2013·Twitter Web Client
 
Twitter
Kevin
@Ginjerk
Did you know Tuba is an acronym for Terrible Underwater Breathing Apparatus? Well it is, according to this know-it-all YMCA lifeguard.
9:44 PM · Sep 17, 2013·Twitter for iPhone
 
Twitter
Eraser Headroom
@drtacomonster
The term “tuba” was originally a capitalized acronym: TUBA. “Tuba” stands for: Terrible Underwater Breathing Apparatus.
3:48 PM · Nov 1, 2014·Twitter for iPhone
 
Twitter
Pete Mandik
@petemandik
Tuba = Terrible Underwater Breathing Apparatus
11:56 AM · Feb 9, 2017 from West Orange, NJ·Twitter for iPhone
   
Reddit—Jokes
Posted by u/Light_bulbnz April 12, 2020
Doot 🎵 Doot
SCUBA is an acronym for Self Contained Underwater Breathing Apparatus. What you may not know is that Tuba is also an acronym…
For Terrible Underwater Breathing Apparatus.
 
LaffGaff
SCUBA ACRONYM
By laffgaff April 15, 2020
SCUBA is an acronym for Self Contained Underwater Breathing Apparatus. What you may not know is that Tuba is also an acronym.
For Terrible Underwater Breathing Apparatus.