The Undecidable CAPTCHA

Description

A reCAPTCHA-style challenge asks, "Select all squares with programs that halt" and adds, "If there are none, click skip." Below the blue instruction panel is a 4-by-4 grid of small code-editor screenshots showing various snippets in dark and light themes, with a blue "SKIP" button at the bottom. The joke turns a routine image-recognition CAPTCHA into the halting problem, asking the user to decide whether arbitrary programs terminate. For experienced engineers, the humor is that this is not merely tedious verification; it is a famous undecidable computer science problem disguised as web security UX.

Common Tags

CAPTCHA CSFundamentals Computerscience AlgorithmicThinking TechnicalAbsurdity CodingHumor DeveloperHumor CodeExecution MemeFormats ControlFlow ExecutionPath

Comments

Anonymous ★ Top Pick Finally, a CAPTCHA where the correct response is either "skip" or a proof that Turing was wrong.

Anonymous ★ Top Pick

Finally, a CAPTCHA where the correct response is either "skip" or a proof that Turing was wrong.
@fearandloathinginchicago 4y

Self-evident joke about Halting problem
@slnt_opp 4y

But AI could just read the text from pictures, classify the language and evaluate the code.........
1. @gbougakov 4y
  
  https://youtu.be/eqvBaj8UYz4
  
  Deleted Account 4y
  
  Yes.
@Agent1378 4y

This post is liked by Gödel.