From an approach of customers' perceived service failures, this study aims at probing into possible service failures made by online vendors. The authors have constructed a set of service delivery blueprint, which reflecting customers' subjective perceptions, by tracking customers' negative emotional experiences. Analyzing eighteen customers' narratives on purchasing upsets during online shopping, the study presents a conceptual framework which illustrates how customers' emotions are invoked and extended. This framework is named seven types of Negative Emotion Triggers. Discrepancies between this framework and prior research are discussed. Two types of NE triggers of this framework, namely ”fuse” and ”inappropriate response”, are found similar in the existing literatures, but other NE triggers such as ”secret detection”, ”service catastrophes”, and ”reminder” are seldom discussed in literature.