  We present a surface analog to a dripping faucet, where a viscous liquid
slides down an immiscible meniscus. Periodic pinch-off of the dripping filament
is observed, generating a succession of monodisperse floating lenses. We show
that this interfacial dripping faucet can be described analogously to its
single-phase counterpart, replacing surface tension by the spreading
coefficient, and even undergoes a transition to a jetting regime. This
liquid/liquid/gas system opens perspectives for the study of the dynamics of
emulsions at interfaces.
