Leave it to The Onion to explain the differences:
Remember the “Charlie Charlie Challenge,” the “game” that went viral back in May?
It worked like this: You get some paper and make a grid with the words “Yes” and “No.” You then put pencils on the axes, one atop of another, so they balance. Finally, you ask Charlie — a supposedly Mexican demon with a not-very-Mexican name — any question you want.
If the top pencil moves, it means Charlie is answering your question…
For some reason, grown human adults were taking this seriously for a while, but I thought we were generally over this as a people.