Title text:

Applying renormalization to bullies successfully transformed Pete & Pete's Endless Mike into Finite Mike.

Transcript:

Cueball poking an atom. Megan looks at it with a hand on her chin]
Cueball: Hey, electron!
Cueball: Stop hitting yourself!
Cueball: Stop hitting yourself!
Megan: ...Wait.

[Caption below the panel:]
Renormalization actually started out as an effort to bully electrons.

Source: https://xkcd.com/3091/

explainxkcd for #3091