Make a (fake) Lava Lamp

Even though this isn't a really real lava lamp, it still looks pretty cool and is sure to get comments the next time you're giving a tour of your house/apartment/underpass. This lava lamp uses an oil/water mixture and some Alka-Seltzer voodoo in a 2-liter bottle for it's psychedelic effect. Don't heat it up because you'll either melt your lava lamp or create enough pressure to make it 'splode.