  We discuss a few examples of rich newly developing field of double parton
scattering. We start our presentation from production of two pairs of charm
quark-antiquark and argue that it is the golden reaction to study the double
parton scattering effects. In addition to the DPS we consider briefly also
mechanism of single parton scattering and show that it gives much smaller
contribution to the $c \bar c c \bar c$ final state. Next we discuss a
perturbative parton-splitting mechanism which should be included in addition to
the conventional DPS mechanism. We show that the presence of this mechanism
unavoidably leads to collision energy and other kinematical variables
dependence of so-called $\sigma_{eff}$ parameter being extracted from different
experiments. Next we briefly discuss production of four jets. We concentrate on
estimation of the contribution of DPS for jets remote in rapidity.
Understanding of this contribution is very important in the context of searches
for BFKL effects known under the the name Mueller-Navelet jets. We discuss the
situation in a more general context. Finally we briefly mention about DPS
effects in production of $W^+ W^-$. Outlook closes the presentation.
