love-and-physics
Explanation
The Joke
Titled "Never Date a Physicist," the comic shows a romantic close-up of a couple about to kiss. One person says "I will love you forever." The physicist partner immediately responds: "Unspecified reference frame."
The Humor
The comic plays on the tension between romantic language and scientific precision. "I will love you forever" is a classic romantic declaration, but to a physicist, the word "forever" is problematic. In physics, particularly in Einstein's theory of relativity, time is not absolute -- it depends on the observer's reference frame. Time passes differently depending on velocity and gravitational fields, so "forever" from whose perspective? In what reference frame? Is this proper time? Coordinate time?
The physicist's terse correction -- "Unspecified reference frame" -- is funny because it treats a heartfelt emotional statement as if it were a poorly written physics problem. It is the romantic equivalent of a professor writing "be more specific" in red ink on a student's paper. The title "Never Date a Physicist" frames this as a universal warning, suggesting that physicists are constitutionally incapable of letting imprecise language slide, even in the most intimate moments. This is a classic SMBC theme: the collision between scientific literalism and normal human social interaction.
References
The joke references Einstein's theory of special relativity (1905), which established that time is relative to the observer's frame of reference. Two observers moving at different velocities will measure different elapsed times between the same events (time dilation). The concept of specifying a reference frame is fundamental to any meaningful statement about time in physics.