Everyone with a projection system knows it all too well -- your bulb will choose to make its exit from the world of functional gadgets when you have a bunch of friends over to show off your HD rig. Take heart, it happens to the best of them: the second season premiere of The Metropolitan Opera's "Live in HD" in West Des Moines was struck down by Murphy's Law this past weekend. Part way through the showing of "Romeo et Juliet" a bulb burned out on the star-crossed lovers, leaving only the soundtrack (accompanied by a grumbling audience). Luckily, the broadcast was being taped, so the theater was able to show the production in its entirety after the bulb was replaced. Word to the wise -- keep a spare bulb handy for mission critical viewing!