mhx writes: "A single character sent by text message could allegedly compromise every iPhone released to date. The technique involves sending only one unusual text character or else a series of "invisible" messages that confuse the phone and open the door to attack. Apple has not released any updates yet. So little can be done, except power off your iPhone to avoid being hacked."
If you push the "extra ice" button on the soft drink vending machine, you won't
get any ice. If you push the "no ice" button, you'll get ice, but no cup.