Here's a fun thing to do with some tea lights.
DO NOT DO THIS ON A FLAMMABLE SURFACE. DO NOT DO THIS INSIDE. BE VERY CAREFUL WHEN DOING THIS. FIRE IS DANGEROUS AND SHOULD BE HANDLED WITH CARE.
Place a couple of tea lights close to each other, as in as close as you can. Light them, place some more tea lights on those, but in such a way that the bottom ones can still burn. light those and continue building until you can't go any higher. Wait until you hear a simmering noise and until your friends aren't paying attention to what you're doing. Then, take some water/other (NON-FLAMMABLE) liquid in your mouth and spit it at the construction. Hilarity ensues.
Who doesn't find fire the awesome?