Found on Flickr; Image by JPStanley
Pi Pumpkin, or is it Pumpkin Pi? A simply hilarious visual pun if you ask me. One of the most commonly used symbols in trigonometry, this little pumpkin reminds one to study, and on Halloween night it says loud and proud, "I am a math/language geek, and I don't care what you think about it!"
Found on Flickr; Image by Mike Madsen
Three pumpkins and one geeky reference for your general enjoyment. The Pumpkin King, Mario, and the Disturbed mascot, "The Guy". Kudos to the (I'll assume) young artists who carved these.
Found on Flickr; Image by vavrajj
Another brilliant visual pun, the broken image link commonly found on old or outdated websites.