[kristiandupont]

I'm sure you will think I'm difficult to deal with then, but I actually take it one step further.

If a person starts to tell me about an idea and I know that we're in the same industry, I will sometimes stop him and let him know that he shouldn't tell me anything that he wants to keep for himself. When you're faced with a certain problem, it's very likely that your solution will look like somebody else's and I don't want anybody upset with me because I "stole" their idea.

Signing an NDA puts you in a bad position and even if there is no real legal threat because of vague formulation or whatever, you risk making enemies which in itself can cost a lot of time one way or another.