“Today I learned that ‘Wet Floor’ signs are not a request”

Many buildings have “Wet Floor” signs, indicating that people should walk there only with great caution. The sign usually means that the floor has just been cleaned. A joke is:
 
“Today I learned that ‘Wet Floor’ signs are not a request.”
 
“Apparently ‘Wet Floor’ signs are not a request” was posted on Twitter on January 12, 2017. “Today I learned ‘Wet Floor’ signs are not a request” was posted on Twitter by Andrew on April 5, 2017.

   
Twitter
Dan Bandekow‏
@Bandekow
Apparently “Wet Floor” signs are not a request.
12:50 PM - 12 Jan 2017
 
Twitter
Andrew‏
@ibxtoycat
Today I learned “Wet Floor” signs are not a request
4:54 AM - 5 Apr 2017
 
Reddit—Oneliners
Today I learned “Wet Floor” signs are not a request (self.oneliners)
submitted April 5, 2017 by Bandekow
 
Twitter
Ryan ‘Fluff’ Bruce‏
@RiffsAndBeards
Today I learned that ‘Wet Floor’ signs are not a request.
4:24 PM - 5 Apr 2017
 
Twitter
Living Sarcasm‏
@SarcasmLiving
Today I learned “Wet Floor” signs are not a request
7:49 AM - 9 Apr 2017
     
Reddit—Jokes
Today I learned that “Wet Floor” signs…
submitted July 20, 2017 by madazzahatter
…are not a request…