Lucid dreaming rocks! Unfortunately I find weed lowers my ability to remember my dreams so I really only have them (actually I only remember them) when I'm out of bud. But when it does happen it's heaps of fun because it's an incredibly realistic reality that you can change and manipulate all you want.

Anybody interested should check out http://en.wikipedia.org/wiki/Lucid_dreaming and http://www.lucidity.com