Doonesbury by Garry Trudeau for December 22, 1993
Slocum: This B+ is wrong, man! You're dissin' me here big time! Math professor: Mr. Slocum, I merely gave you the grade you deserved. Slocum: Can't be, man! This is way off base! Professor: As was your entire first proof, in which you held the square root of 144 to be 15. It is, in fact, 12. Slocum: Well, sure, from a narrow, absolutist, eurocentric perspective, maybe it's 12. Professor: So? Slocum: So my culture teaches it's 15, man! Professor: Fascinating. Would this be an advanced civilazation?