  Let $G = (V,E)$ be a simple graph and let $\{R,B\}$ be a partition of $E$. We
prove that whenever $|E| + \min\{ |R|, |B| \} > { |V| \choose 2 }$, there
exists a subgraph of $G$ isomorphic to $K_3$ which contains edges from both $R$
and $B$. We conjecture a natural generalization to partitions with more blocks.
