“Bullets and fireworks are the only things that do their job after they are fired”

Who (or what) does a job after being fired? “Bullets are the only things that do their job only after they are fired” was posted on Reddit—Shower Thoughts on July 31, 2015.
 
“Bullets and fireworks are the only things that do their job after they are fired” was posted on Twitter on January 22, 2016.
   
           
Reddit—Shower Thoughts
Bullets are the only things that do their job only after they are fired.
submitted July 31, 2015 by Flatline_hun
 
Twitter
Anthony Jensen‏
@ZeroTheSpartan
Bullets are the only thing that do their job after they are fired
6:23 PM - 31 Jul 2015
 
Twitter
wisehallock‏
@loaf21
Bullets are the only thing to do their job after they are fired
9:06 PM - 2 Aug 2015
 
Twitter
Timothy Palmer‏
@TimPalmer111
Bullets are the only thing that do their job after they are fired
11:05 AM - 4 Aug 2015
 
Twitter
bundebunde chongo‏
@bundebunde
Bullets and fireworks are the only things that do their job after they are fired..🤓
4:03 PM - 22 Jan 2016
 
Twitter
Chike Martin‏
@chikemartin
Bullets and fireworks are the only things that do their job after they are fired.
1:13 PM - 12 Feb 2016
 
Reddit—Shower Thoughts
Bullets and fireworks are the only things that do their jobs after they are fired
submitted July 13, 2016 by ImpulseFlea92
 
Reddit—Shower Thoughts
Bullets are the only things that do their job after they are fired.
submitted February 2, 2017 by BasedOnAir
   
Reddit—Jokes
Bullets and fireworks are the only things that do their job
submitted March 28, 2017 by hehehuehue
After they are fired
 
Reddit—Shower Thoughts
Bullets and Fireworks are the only things that do their job after they are fired.
submitted October 13, 2017 by flynngilmore23