Explore the world of REPLs (Read-Eval-Print Loops) in unconventional environments during this 59-minute conference talk from EmacsConf 2023. Dive into the integration of REPLs with Lua, LaTeX, LPeg, LPegRex, and TikZ as Eduardo Ochs demonstrates innovative approaches to interactive programming. Learn how these tools can enhance your workflow and expand your capabilities within the Emacs ecosystem. Gain insights into leveraging REPLs for improved productivity and creative problem-solving in various programming and typesetting contexts.