In order to build a dialogue system that can interact with humans in the same way as humans interact with each other, it is important to be able to collect conversational data. This paper introduces a dialogue recording method where an eavesdropping human operator sends instructions to the participants in an ongoing humanhuman task-oriented dialogue. The purpose of the instructions is to control the dialogue progression or to elicit interactional phenomena. The recordings were used to build a Swedish synthesis voice with disfluent diphones. 