I just stumbled across this in one of my notepads. Try this:
Put pen to paper for two solid minutes, keeping the pen moving. Don’t hold back, and don’t edit yourself. Resist the urge to care about what’s coming out, as that will defeat the purpose. Turn off your left hemisphere and let the right side take over. Create an uninterrupted flow between the subconscious and the pen, and then get out of the way of the traffic. Continue until the page is full or until the two minutes is up. It’s a good workout.
This one’s from around Christmas, 2005, sitting in the dark in the wee hours of the morning: