After a general introduction, I would like to present two examples of
electronic (fermionic) systems that exhibit positive current
crosscorrelations. The first example is a three-terminal device with one
superconducting terminal and two normal-metal terminals. We calculate
the full distribution of transmitted charges in the two
symmetrically-biased normal terminals.  In a wide parameter range, we
find large positive crosscorrelations between the currents in the two
normal arms.  As a second example, we study current fluctuations in an
interacting three-terminal quantum dot with ferromagnetic leads.