Find the evil tiki where the Tony Hawk's Pro Skater 2 bonus level can be found. Get on top of that tiki. The easiest way to do so is to get off your board and jump on top. Once on top, remount your board, but at the same time hold the Analog-stick Back so you do not move anywhere. Then, perform a manual on top of the tiki. The longer you hold it, the more smoke will start leaking out the top. If done correctly, you will hear a sound resembling scraping wood.