Satan knows how to push our buttons and pull our levers. It's amazing how He can use the little things in life to do it. Jesus was wise enough to recognize the source;
Matt 16:23 (KJV)
23) But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me: for thou savourest not the things that be of God, but those that be of men.
Jesus was able to see beyond Peter to the root source.