  We collect some peculiarities of higher-order fractional Laplacians
$(-\Delta)^s$, $s>1$, with special attention to the range $s\in(1,2)$, which
show their oscillatory nature. These include the failure of the polarization
and P\'olya-Szeg\"o inequalities and the explicit example of a domain with
sign-changing first eigenfunction. In spite of these fluctuating behaviours, we
prove how the Faber-Krahn inequality still holds for any $s>1$ in dimension
one.
