Jizz-O-Lantern
First, you will need someone willing to blow you and a black light. The person (to be gender neutral) gives you a blowjob and you cum in their mouth and/or on their face. The person should not swallow and swish it around in their mouth. They need to then open their mouth. Then you shine the black light on them and watch their head glow like the jack-o-lantern.
Dude, the black lights in my room were an awesome idea. I lit Katie up like a jizz-o-lantern last night.