Good photos?

So people keep asking me if I've 'got any good photos' while I'm wandering round taking pictures. I don't know quite why this question annoys me so much, it's a perfectly reasonable question to ask, I suppose. However, as I never look at the photos properly until they're uploaded, I end up answering with a surly and slightly arrogant 'I don't know, yet' which annoys me further. Silly me.