I remember one of those Greenpeace chicks trying to get me to join their group. She was wearing all those Greenpeace buttons and T-shirts, and had some flyers about the group. She wasn't exactly the most upkept person (though admittingly, neither was I at the time. :-P). As for crazy, well, my meeting with her wasn't long. I just politely said no, and she was on her way. Maybe she was one of the saner ones? Hehehe.
They are on the Seattle sidewalks a lot, trying to raise funds. Once there were two little twerps, a male (questionable) and a female (cute) and they asked me for a donation. I was in a particularly foul mood that day and told them that "commies are for killing, not funding", and walked away.