Why Not Smile's Dream Delivery project involves participants whispering their dreams into an empty bottle through the dream funnel, pictured here.
Once the bottle is full of dreams it is vacuum sealed.
"Within ten years, the owner of the dream will be surprised by its unannounced delivery. Upon receiving it, the owner will feel his dreams anew and hear his voice at www.whynotsmile.com."
I've heard weirder ideas.