Customer that holds up the line at an ice cream shop by repeatedly asking for free samples because he/she cannot decide what to order. This person is oblivious to the fact that there is only one employee behind the counter who is becoming as annoyed as the people in line.
Person 1: What took you so long at Baskin-Robbins? It doesn't look very busy in there.
Person 2: I had to wait ten minutes because of a sample abuser who tried virtually every flavor before ordering chocolate. What a jerk!