Is it possible to make a cannon out of a tree? Could a drunk person really fool a Breathalyzer test? Can Adam's tongue piercing withstand the electric force of a lightning bolt?

In this episode the Adam and Jamie test:
1) If using a piercing or jewels makes you more vulnerable to lightning in a storm.
2) If is possible that an ancient small town built a tree cannon that exploded and killed all the village.
3) if you can beat the breath test, like biting mint or onions.