A pasta riddle is:
 
Q: What did the noodle say when leaving the room?
A: “Pasta la vista, baby!”
   
“Pasta la vista” is a portmanteau of “pasta” and “hasta la vista” (Spanish for “goodbye” or “farewell”). “Hasta la vista, baby” is a famous movie line from the film Terminator 2: Judgment Day (1991). “Pasta la vista” was used in a newspaper headline in 1974. “‘What did the mama spaghetti say to the baby spaghetti?’ On her way out the door she yelled, ‘Pasta la vista, baby!’” was printed in a 1997 book.
 
“What did the noodle say when leaving the room? Pasta la vista, baby!” was posted on Twitter by Hanna Banana on August 11, 2013. “What did the noodle say when they left the room? pasta-la-vista baby” was posted on Twitter by “dad jokes” on May 13, 2018.
 
“What did the spaghetti say to the other spaghetti?”/“Pasta la vista, baby!” is a similar riddle.
 
         
Wikipedia: Hasta la vista, baby
“Hasta la vista, baby” is a catchphrase associated with Arnold Schwarzenegger’s title character from the 1991 science fiction thriller film Terminator 2: Judgment Day.
 
Origination and uses
The term “Hasta la vista” is a Spanish farewell that can be literally translated as “Until the (next) sighting” and means “See you later” and “Goodbye”. This term, with the added word “baby” - “Hasta la vista, baby” - was used in the popular hit song from 1987, “Looking for a New Love” by Grammy Award winner Jody Watley. It was also used in the 1988 Tone Lōc single “Wild Thing”.
   
Terminator 2: Judgment Day
“Hasta la vista, baby” became a famous catchphrase when it was used in the 1991 film Terminator 2: Judgment Day, which was written by James Cameron and William Wisher Jr.
     
10 August 1974, South China Morning Post (Hong Kong), pg. 11, col. 2:
Pasta la vista at HK Hotel
 
23 October 1983, San Diego (CA) Union, Tom Blair column, pg. B-1, col. 1:
Dan Mizock, co-owner of the six-week-old Pasta La Vista in Mission Hills, is doing brisk business already, And no, Pasta La Vista doesn’t mean you get your pasta later. The way Mizock interprets his own play on “hasta la vista,” it means you’ll see the restaurant around in lots of places.
 
Google Books
Vanishing Act
By Cora Taylor
Red Deer, Alberta, Canada: Red Deer College Press
1997
Pg. 70:
She’d even tried, “What did the mama spaghetti say to the baby spaghetti?” On her way out the door she yelled, “Pasta la vista, baby!”
 
Twitter
Kelly Conway
@KellyEConway
What did the spaghetti say when it left the room? PASTA LA VISTA
7:41 PM - 18 Jun 2011
 
Twitter   
Hanna Banana
@ONeillHanna
What did the noodle say when leaving the room?  Pasta la vista baby!
11:50 PM - 11 Aug 2013
 
Twitter
katefisher
@think_emporium
What did the spaghetti say when he left the room? Pasta la vista, baby. #getyourthinkon #jokeoftheday #yourwelcome
3:41 PM - 15 Nov 2015
 
Twitter
dad jokes
@dadtellsjokes
What did the noodle say when they left the room? pasta-la-vista baby
10:37 PM - 13 May 2018
 
Twitter
dad jokes
@dadtellsjokes
What did the noodle say when they left the room?
pasta-la-vista baby
10:38 PM - 9 Jul 2018
 
(Trademark)
Word Mark PASTA LA VISTA
Goods and Services (CANCELLED) IC 042. US 100. G & S: Restaurant Services. FIRST USE: 19830901. FIRST USE IN COMMERCE: 19830901
Mark Drawing Code (1) TYPED DRAWING
Serial Number 73473736
Filing Date April 4, 1984
Current Basis 1A
Original Filing Basis 1A
Published for Opposition December 4, 1984
Registration Number 1320056
Registration Date February 12, 1985
Owner (REGISTRANT) Pasta La Vista, Inc. CORPORATION CALIFORNIA 808 W. Washington St. San Diego CALIFORNIA 92103
Attorney of Record James E. Clevenger
Disclaimer No claim is made to the exclusive right to use “Pasta”, apart from the mark as shown.
Type of Mark SERVICE MARK
Register PRINCIPAL
Live/Dead Indicator DEAD
Cancellation Date June 18, 1991