Manalto

Once in a while when I get "no problem" I respond with some form of "Oh... I didn't think it would be." Not very often, because it's hard to say and not sound snarky; it has to be delivered with befuddled innocence, and I'm not always up to the task. "No problem" is useful when someone says, "Oh, thank you! It must have been so much trouble!" although, depending on the situation, I still prefer "I was happy to do it." (in other words, "Yes, it wasn't easy, but I chose to make the effort.") or "It was nothing, really.