“Window or aisle?”/“Window or you’ll what?”

“Aisle” shouldn’t be confused with “I’ll,” but there’s an airplane joke:
 
Airline Check-In Clerk: Window or aisle?
Airline Passenger: Window or you’ll what?

 
The joke was posted on the newsgroup uk.railway on September 26, 2005, and has been credited to English comedian Harry Enfield.
 
       
Wikipedia: Harry Enfield
Henry Richard Enfield (born 30 May 1961) is an English comedian, actor, writer, and director. He is known in particular for his television work, including Harry Enfield’s Television Programme and Harry & Paul, and for the creation and portrayal of comedy characters such as Kevin the Teenager and Loadsamoney.
 
Google Groups: uk.railway
“Mancunians fly by train”
matt
9/26/05
(...)
[enfield]
Check-in Clerk:  Window or Aisle Sir ?
Wayne:  Window or you’ll what ? 
     
Twitter
Simon Lambert
@snow_gibbon
Replying to @mikebutcher
@mbites window or you’ll what?
10:20 AM - 5 Sep 2008
   
Twitter
Karl Bunyan
@karlbunyan
“window or aisle” “window or you’ll what?...” Classic Harry Enfield
7:54 AM - 17 Apr 2009
   
Twitter
Dave
@davesusetty
@TheVinnyShow My paranoia always prevents me flying. “Window or aisle?” “Window or you’ll what?!”
1:55 PM - 9 May 2010
 
QI.com
Series H, Episode 13
Holiday
Guests: Bill Bailey, Rich Hall, Rob Brydon
Aired: 17 December 2010, BBC One

The girl at the Ryanair check-in desk said, “Window or aisle?”
I replied, “Window or you’ll what?”
JIMMY CARR
 
8 June 2011, The Sun (London, UK), :Have a laugh!,” pg. 9:
AT the budget airline check-in desk a burly bad-tempered assistant asks: “Window or aisle?”
 
The terrified passenger pipes up: “Window or you’ll what?”
   
Twitter
What The Frock!
@WTFrock_Comedy
Replying to @MinutemanPress
@MinutemanPress Window or you’ll what? (To quote Harry Enfield) x
4:42 PM - 29 Mar 2013
 
Reddit—Dad Jokes
I was checking in to a flight and the time came to pick a seat (self.dadjokes)
submitted September 8, 2018 by ThirteenthBingpot
The flight attendant asked “Window or aisle?”
To which I replied “Window or you’ll what?”