We need to choose a CAPTCHA image.
To clarify, what we're looking for is an amusing picture to go on the CAPTCHA page...along with the CAPTCHA. The image will just be for added comedic effect; it won't be the CAPTCHA itself (the CAPTCHA is from reCAPTCHA). Check out the "HELLO FELLOW ROBOT" image on the current captcha page: gis.stackexchange.com/captcha
It would be interesting if we could find an image that visually demonstrated the idea of a CAPTCHA.