I had a dream recently where I was swimming with some friends having a good time. The water was moving and I could feel stuff under the surface. Looking, I could see that we were flowing over massive amounts of garbage. We were forced to keep our feet up to keep from scraping against it. Looking at everyone else, they seemed to just be like, "Yep, whatever... What are you going to do about it?"
I don't dream very often these days, I'm fairly certain that marijuana affects dreaming, I also don't sleep in very much.
This dream made me think about how we're in a society with piles of trash under the surface but we're all just ignoring it.