I live my life by certain rules. When those rules are jeopardised, I feel uncomfortable.
One such rule is that, when buying coffee from 7Eleven, I only wait if there are two or fewer people in front of me. So if I'm the third person, that's sweet - but if I'm the fourth, I'll go elsewhere.
Earlier this morning, I was in line to buy my large skinny flat white. I was third in the queue. THEN, the person in front of me completely rocked my world by making not one, not two, but
three coffees, essentially making a mockery of my system.

What are some minor things that negatively tickle your whiskers in life?