  We introduce a novel lower bound technique for distributed graph algorithms
under bandwidth limitations.
  We define the notion of \emph{fooling views} and exemplify its strength by
proving two new lower bounds for triangle membership in the CONGEST(B) model:
  (i) Any $1$-round algorithm requires $B\geq c\Delta \log n$ for a constant
$c>0$.
  (ii) If $B=1$, even in constant-degree graphs any algorithm must take
$\Omega(\log^* n)$ rounds.
  The implication of the former is the first proven separation between the
LOCAL and the CONGEST models for deterministic triangle membership.
  The latter result is the first non-trivial lower bound on the number of
rounds required, even for \emph{triangle detection}, under limited bandwidth.
  All previous known techniques are provably incapable of giving these bounds.
  We hope that our approach may pave the way for proving lower bounds for
additional problems in various settings of distributed computing for which
previous techniques do not suffice.
