“Head of lettuce. That must be a boring job”

People often seek a job of the “head” of something. There’s a joke:
 
“Head of lettuce. That must be a boring job.”
 
The joke was posted on Twitter on June 2, 2012.
 
     
Twitter
LexFuturus
‏@LexFuturus
Head of lettuce.
That must be a boring job.
3:20 PM - 2 Jun 2012
 
Twitter
Steve Varty
‏@4EverSteve
Head of lettuce.
That must be a boring job!
3:24 PM - 2 Jun 2012
 
Twitter
Peter Fletcher
‏@PeterFletcher5
Head of lettuce.
That must be a boring job.
3:46 PM - 2 Jun 2012
 
Twitter
Insomniac Dalek
‏@InsomniacDalek
“Head of lettuce….....That must be a boring job. @HolyDalek ” Not if you’re a vegetable ...
4:18 PM - 2 Jun 2012
 
Twitter
Simple Cloud
‏@_simplecloud
Head of lettuce.
That must be a boring job…. http://www.funspot.co.za/index.php/joke/13823 …
12:51 AM - 27 Mar 2013
 
Twitter
John Collins
‏@HolyDalek
Head of lettuce.
That must be a boring job.
2:58 PM - 8 Mar 2016