“How do you color a cactus?”/“With a Sharpie.”

How sharp is a Sharpie writing instrument? This riddle was posted on Reddit—Dadjokes on July 10, 2020:
   
Q: How do you color a cactus?
A: With a Sharpie.
   
   
Wikipedia: Sharpie (marker)
Sharpie is a brand of writing instruments (mainly permanent marker pens) manufactured by Newell Brands, a public company, headquartered in Atlanta, Georgia. Originally designating a single permanent marker, the Sharpie brand has been widely expanded and can now be found on a variety of previously unrelated permanent and non-permanent pens and markers formerly marketed under other brands. This article focuses on the legacy Sharpie permanent marker line.
 
Reddit—Dadjokes
Posted by u/gngwarlord July 10, 2020
How do you color a cactus?
With a Sharpie.
 
Twitter
Kintinue
@Kintinue
How do you color a cactus?
<_<

>_>
With a Sharpie!
5:03 PM · Jul 10, 2020·Twitter for iPhone
 
Twitter
Just Kevin⁷
@Based_SkylarkV2
how do you color a cactus?
with a sharpie
6:34 PM · Jul 10, 2020·Twitter for iPhone
 
Twitter
Just Kevin⁷
@Based_SkylarkV2
Replying to @AKATSUKJOY
sigh…. cactus are sharp so you’d use a sharpie marker to color it (Explaining the joke above.—ed.)
7:01 PM · Jul 10, 2020·Twitter for iPhone