To keep'em together. That's why

This is a 6-panel grayscale comic depicting the relatable experience of intrusive thoughts from one's brain when trying to fall asleep. The first panel shows a simple cartoon stick figure sleeping peacefully in bed. In the second panel, an anthropomorphized version of the person's brain appears, wide-eyed, asking the random question 'Why balls have a stitch line?'. The third panel shows the annoyed person replying 'Stop it, I'm trying to sleep.'. The fourth and fifth panels show the person trying to fall back asleep, growing increasingly frustrated by the lingering thought. The final panel shows the person wide awake, frowning while looking at their phone, unable to sleep because they are now fixated on the odd question their brain posed. The title provides the punchline answer to the question, implying the stitch line exists to keep the two halves of the testes together.

This meme was originally posted on the platform 9Gag, retrieved via RSS feed. It uses a popular, widely shared comic format that illustrates the common experience of random intrusive thoughts disturbing people when they are attempting to rest. The post's title functions as the punchline to the question posed in the comic.