My interview at Atomwise introduced me to a fun way: pick a Stack Overflow question that includes some code, use the dev-tools to nuke any answers, and print the question (player's choice about leaving any clarifying comments intact). Then have said candidate answer the question for you. Obviously it requires some curation to find the not-facepalm-stupid questions, but I'd bet there are plenty in each language

It can show the ability to read code, experience with any language or framework footguns, how to work with a malspecified problem (it is S.O. after all), etc, depending on the kinds of risks the screen is trying to drive down in your specific team