He responded with a kind "thank you" but seemed annoyed by my response of "no problem".

     With a witty smile on his face he explained that "no problem" implied that there was or could have been a problem in handing over the container. "is that tub of butter too heavy for you?" he asked but responded for me "your're learning Calculus but you can't pass the butter? How is handing over the butter a problem?"

      I thought about it, and poured out "you're welcome". Simple enough it is about the other end when communicating with family, friends, or business clients.