How private are private conversations in public space? 

While theoretically we are all aware about the possibility and also high probability of someone else listening into our private conversations when we are in public spaces, we tend to forget this often in our daily lives and conversations. Generally we do not mind, we are not intimidated or scared by this fact, but when watched or better, listened to by a camera or recording device, we feel surveilled and offended. We fear that what we might say or do is kept and in the worst case used against us.