I think it depends on the situation. If the guy who asks has been curtious so far (i.e. doesn't step into the river five feet down stream of you as your working your way down a hole) then I'd be more likely to show him. Occassionally If I've been talking with the person for more than 15 minutes and I'm catching multiple fish and their getting skunked I'll even give them a lure (as long as I have or can get multiples). This is very helpful if you fish a particular area on a regular basis and helps build friendships, plus later on it always comes back to you.