“Could you take a couple steps back. I have a nut allergy”

“Nut” can mean a food, but it can also mean a crazy person. A joke is:
 
“Could you take a couple steps back. I have a nut allergy.”
 
The “nut” pun was posted on Twitter by “A Human Being‏” on September 9, 2015.
 
 
Twitter
A Human Being‏
@dhumann
“Could you take a couple steps back. I have a nut allergy.”
10:49 PM - 9 Sep 2015
 
Twitter
pbnj218‏
@pbnj218
RT @dhumann: “Could you take a couple steps back. I have a nut allergy.” ....The exact words I said to my first boyfriend
3:36 PM - 20 Sep 2015
 
Twitter
Frank Harvie‏
@g0lg0thaza
I hear this all the time… : “Could you take a couple steps back. I have a nut allergy.”
11:50 PM - 20 Sep 2015
   
Bangalore (India) Mirror
WORD OF THE DAY: 28TH SEP, 2015
Bangalore Mirror Bureau | Updated: Sep 27, 2015, 08.36 PM IST
(...)
* Could you take a couple steps back. I have a nut allergy.
 
Twitter
Chetan Bhakt‏
@ChetanBhakt
“Could you take a couple steps back. I have a nut allergy.”
12:43 PM - 17 Apr 2017