“We had random drug testing at work today. The pcp was my favorite”

Some workplaces have drug testing. A joke is:
 
“We had random drug testing at work today. The pcp was my favorite.”
 
The joke was posted on Reddit—Jokes on September 1, 2017.
     
   
Reddit—Jokes
We had random drug testing at work today.
submitted September 1, 2017 by Mombo1212
The pcp was my favourite.
 
Twitter
The Rochdale Herald‏
@RochdaleHerald
We had random drug testing at work today. The pcp was my favourite.
11:31 AM - 1 Sep 2017
 
Twitter
localhostcomedy‏
@localhostcomedy
We had random drug testing at work today.
The pcp was my favourite.
1:49 PM - 1 Sep 2017
     
Twitter
Best of Reddit‏
@BestoReddit
We had random drug testing at work today. : The pcp was my favourite.
2:06 PM - 1 Sep 2017
 
Twitter
Jan Schill‏
@schill_jan
We had random drug testing at work today.
The pcp was my favourite.
-from Reddit-
5:46 PM - 1 Sep 2017