Vestigial behavoirs?

Boris B wrote:

Yeah, that’s actually one of the things that got me thinking about this topic in the first place…
Mr.Zambezi wrote:

That was the other one that got me started on this quest. Sounds like we’re all reading the same articles. I don’t find this one particularly conclusive.
Jinx wrote:

Right and I don’t make that distinction either. In fact, I’m trying to ignore both structural and chemical vestiges and see if we can identify one that is purely behavoral.

Another thing that comes to mind is fear of heights. I’ve heard that babies have an ingrained, instinctual fear of heights. Maybe this is vestigial in some way.

Another thread http://boards.straightdope.com/ubb/Forum3/HTML/007069.html about urinating when terrified may be what you are looking for. This likely evolved to reduce the risk of peritonitis, but is usually just an embarassment now.

How about fainting in stressful situations?
Were some of our ancestors “playing dead”?