Dimitris Xygalatas engages the problems of the generalizability and comparability of research results and their “ecological validity.” Xygalatas argues for the “methodological interaction between forms of participant-observation and experimentation,” combining the insights of approaches often seen as at odds with each other, to produce a collaborative and strong version of interdisciplinary research. Drawing from his own work on extreme religious rituals such as fire-walking and body piercing, the author demonstrates the benefits of research designs that include perspectives from the “field” and the “lab.”