I usually make brains using expanding foam insulation, but if you want to make them from the pumpkin itself, here is a great example. I am told it took a few hours to accomplish, but it looks pretty cool.
When I am not carving pumpkins, I run the world's most private drugstore. ShopInPrivate.com
Also, last year, my company took over RomanticGifts.com, so if you need a romantic gift for Christmas, a birthday or an anniversary, please consider our wonderful store.
My co-workers and I run the biggest store for bachelorette party items in the world. It is lots of fun. We have fun jobs.