Double radiative decay $Z \rightarrow f\bar{f}\gamma\gamma$ in the   Standard Model
  Z-boson decay $Z \rightarrow f\tilde{f}\gamma\gamma$ in the Standard Model is analysed. The distribution function on the invariant masses of the photon and fermion pairs is calculated in the leading logarithmic approximation. It is shown that this distribution function has a specific shape of a ``crest''. (To be published in Mod.Phys.Lett.A) 
N.V.Mikheev and A.Ya.Parkhomenko