Glayvin! Prof. Frink's latest invention is his greatest ever! It's called the Frinkiac. You can search 3 million screencaps from The Simpsons for your favorite quotes. You can also add your own text to screencaps from the show.
Sean Schulte, Paul Kehrer, and Allie Young invented the Frinkiac because they like to quote The Simpsons all the time, but can't always find appropriate screencaps. They described the project to Wired:
Frinkiac cuts every scene into 100 parts, takes the average color of each part, and compares its coloration to the most recently saved image. If they’re different enough, voila!, new screenshot, with minimal redundancy through the hundreds of hours of video being parsed.
-via Flavorwire