#3027: Exclusion Principle

XKCD comic, described below.
Transcript

[Inside panel:]

Fundamental Forces

1. Gravity
2. Electromagnetism
3. The Weak Interaction
4. The Strong Interaction
5. Electrons are weird about each other

[Caption below list:]

Big news: Physicists have finally given up on trying to explain about the "exchange interaction" and agreed to just make the exclusion principle a force.

(Sourced from explainxkcd.com)

Fermions are weird about each other in a standoffish way. Integer-spin particles are weird about each other in a 'stand uncomfortably close while talking' kind of way.

ExplainOriginal