Vent: When a friend asked me to test their website's security without permission
A buddy wanted me to poke around his company's site to find holes. I told him that's not right unless you have clear permission. Always get written okay before any security checks.
About the point that waiting for permission might make you miss a chance, I read a tech blog that had a real story on this. They said a well meaning tester got a cease and desist letter after checking a site without clear go ahead. The blog explained how even with good finds, no written permission can turn into a legal mess. So from what I've seen, getting that official okay is just the smart move.