Something you wouldn't think is possible, but can be done.
First, fill a
flask with water, about 1/10 of the way full. Bring the
water to a full
boil for about thirty
seconds. Now
cork the bottle
securely. The water should stop boiling as soon as the flask is
sealed off. Now, wait until the flask
cools down
a bit (unless you really, really like
burning yourself),
invert the flask, and put as much as your
palm as possible onto the flask. The water will
resume boiling!!