While the rule of thumb is that in TCS papers the authors are ordered alphabetically, there are some notable counterexamples that comes to mind, wherein the authors are ordered in a different way, e.g.,
Algebraic Methods for Interactive Proof Systems [Lund, Fortnow, Karloff, Nisan]
A Method for Obtaining Digital Signatures and Public-Key Cryptosystems [Rivest, Shamir, Adleman]
Word Problems Requiring Exponential Time [Stockmeyer, Meyer]
What is the story behind the unusual author ordering in these papers?
Are there any other examples of major TCS papers in which the order of the authors is not alphabetical?