  It is pointed out that there are now known four very close pairs of QSOs with
separations < 5 arcsec and very different redshifts. Several estimates of the
probability that they are accidental configurations range between 10^{-7} and
3.5 x 10^{-3}. We conclude either that this is further evidence that QSOs have
significant non-cosmological redshift components, or that thave significant
non-cosmological redshift components, or that the pairs must be explained by
gravitational lensing.
