“Out of my mind—back in five minutes” (office door sign)

“Out of my mind—back in five minutes” is a jocular saying that has been printed on many gift items, such as posters, bumper stickers and T-shirts. It’s a humorous variation of the office sign “Out to lunch—back in 30 minutes.” “Out of my mind—back in five minutes” has been cited in print since at least 1994 and is of unknown authorship.
       
 
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Going out of my mind, back in 5 minutes.
 
Google Books
Money Talks, But Mine Just Says Goodbye:
More Bumper Stickers from the Information Highway
By Arthur Goldstuck and William Ramwell
Joahnnesburg: Zebra
1996
Pg. 83:
Going out of my mind. Back in five minutes.
 
27 September 1996, Palm Beach (FL) Post, pg. 1F:
Here’s a bumper sticker definition of temporary insanity (courtesy of a weathered Buick): Out of my mind ... Back in 5 minutes.
     
Google Groups: alt.tasteless.jokes
dave headman
8/6/97
Actual Bumber Stickers!!
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Out of my mind. Back in five minutes.
 
23 August 1997, Daily News-Record (Harrisonburg, VA), “Bishop’s Mantle” by Jim Bishop, pg. 10, col. 3:
Out Of My Mind; Back In Five Minutes.
 
OscarFish.com Forum
Why no cure for HITH?
by Oscar_newbie » Sat Mar 24, 2001 1:25 am
(...)
“Outta my mind, back in 5 minutes”
   
Google Books
The Meaning of Larf:
A Wealth of Wit, Wisdom and Weally Silly Words
By Philip Bradbury
Bradbury Corporation LLP (bradburycorp.info)
2010
Pg. 151:
Out of my mind. Back in five minutes.