In contemporary England, amateur paranormal investigators are actively engaged in attempts to produce objective knowledge about the ghostly and paranormal. Their project requires them to balance subjective, personal encounters with objective, technologically mediated ones. In doing so, they struggle to align their project with dominant understandings of rationality. Drawing on an ethnographic study of knowledge production among paranormal investigators, I explore paranormal investigators' use of humour and argue that they rely on humorous performances to align themselves with a powerful, hegemonic notion of rationality. Through their humour, they do not contest the scope of rationality; rather, they locate themselves as central to it.