A “running joke” was posted on Reddit—Dad Jokes on October 25, 2018:
     
“Every morning for the past six months, I announce loudly to my family that I’m going for a jog, and then I don’t. It’s my longest running joke of this year.”
   
“I wear a mask while jogging. It’s a running gag” is another running gag/joke.
         
     
Wikipedia: Running gag
A running gag, or running joke, is a literary device that takes the form of an amusing joke or a comical reference and appears repeatedly throughout a work of literature or other form of storytelling. Though they are similar, catchphrases are not considered running gags.
         
Reddit—Dad Jokes
Every morning for the past six months, I announce loudly to my family that I’m going for a jog, and then I don’t. (self.dadjokes)
submitted October 25, 2018 by porichoygupto
It’s my longest running joke of this year.
     
Twitter
keepingitcreel
@Keepingitcreel
Every morning for the past six months, I announce loudly to my family that I’m going for a jog, and then I don’t. It’s my longest running joke of this year.
9:48 PM - 24 Oct 2018 (Posted after the above.—ed.)
   
Twitter
Dad Jokes by dadbot
@dadbot2000
Every morning for the past six months, I announce loudly to my family that I’m going for a jog, and then I don’t. It’s my longest running joke of this year.
12:21 AM - 25 Oct 2018
 
Reddit—Cleanjokes
Every morning for the past six months, I’ve announced loudly to my family that I’m going for a jog and then I haven’t… (self.cleanjokes)
submitted October 27, 2018 by madazzahatter
It’s a running joke…
 
Reddit—Cleanjokes
Every morning for the past six months, I announced loudly to my family that I’m going for a jog and then I don’t go… (self.cleanjokes)
submitted November 10, 2018 by madazzahatter
It’s a running joke…