import time
import threading

x = None

class Timer(threading.Thread):
    def __init__(self, seconds):
        self.runTime = seconds
        threading.Thread.__init__(self)
    def run(self):
        time.sleep(self.runTime)
        print "Buzzzz!! Time's up!"
        
class CountDownTimer(Timer):
    def run(self):
        global x
        counter = self.runTime
        for sec in range(self.runTime):
            print counter
            if x == 1:
                print 'BOOM'#
            time.sleep(1.0)
            counter -= 1
        print "Done."