Good on you SrPato. I hate hate hate when people litter, especially knowingly.
One summer day in the South Bay a family was packing up to leave the beach and they left a ton of trash all over. I smiled and yelled out to them, "Excuse me! I think you forgot your trash!!"
One of the men sheepishly smiled and said, "Oh yeah..." then walked back and proceeded to pick every single piece up while I smiled innocently and watched him like a hawk.
I used to pick up at least one piece of trash every time I was down at the beach... need to start doing that again.