Don’t joke about it, it’s a real thing! You can get paper filters in espresso portafilter sizes, and some people use them under the coffee puck and some above (

Don’t joke about it, it’s a real thing! You can get paper filters in espresso portafilter sizes, and some people use them under the coffee puck and some above (to distribute the water more evenly to try and reduce channeling of water through the grounds).