I don't think this is a true mathematical question, and if it occurred in the future I would vote to close it. An explanation of the illusion can, of course, be posted in the comments.
I do think, however, that a community wiki style question asking people to list their favorite math jokes can be successful. (This has happenedhappened on MO.) It is a soft, big-list question, the type that is not strictly encouraged here, but sufficiently universal that most will enjoy it.