How to avoid writer's block

Apparently, the way to cure writer's block is to think of it as talker's block:

No one ever gets talker's block. No one wakes up in the morning, discovers he has nothing to say and sits quietly, for days or weeks, until the muse hits, until the moment is right, until all the craziness in his life has died down.

I understand where this is going, but if you think there's no such thing as talker's block, you've never seen one of my students give a presentation.