A new interaction of globular clusters with galactic field stars, the deceleration (by dynamical friction) of high-velocity field stars diffusing through individual globular clusters, is investigated. This frictional interaction contributes to cluster heating and, in conjunction with disc shocking and other mechanisms, helps to reflate the evolution of globular clusters. Moreover, penetrating field stars of low relative velocity can even be captured by globular clusters. The calculated rate of capture suggests that there is a modest population of stars having an origin external to the clusters in which they now reside