A well-carved jack-0-lantern deserves to be photographed at least three times. Once in the daylight, once at night with a slow exposure and once from the inside.
If you already cut a hole in the back of your jack-o-lantern for ventilation, then it’s easy to stick your camera in and fire off a few shots. (If not, get the knife and add a lens-sized hole in the back; your candle will thank you.)
Getting a good, unblurry shot isn’t so easy — I haven’t quite got it down yet, as you can see — but even a half-decent one will still give you a weird momento of your pumpkin’s inner personality.