Haha oh yes my friend.
Sometimes I go on bidding sprees on Elance just before bed, then wake up and accept a bunch of projects haphazardly. It's a pretty common theme in my life actually; which sucks hehe. I took a gig to write 10 articles in a month promoting The Strand Hotel in Myanmar.. I knew Former-Burma was a hotspot for heroine trade and poverty, but I didn't know that I was literally trying to lead people into an active warzone lol.
You then weigh the pros and cons; potentially convince people to make a really bad decision for a small profit, or take a small hit on your Elance ranking? I try to be a good person most of the time.
I've got a bunch more stories, too. This happens all the time unfortunately. It's hard to be picky in this industry too, at least until you've got an established profile somewhere.