Be afraid. Be very afraid.
A short, simple phrase that serves as a warning to Formula 1 following a demonstration in what can only be described as Teutonic reliability and efficiency from Mercedes over its four days of running at Barcelona's Catalunya circuit in the first pre-season test.
After two years of domination of F1, winning 32 of 38 grands prix and back-to-back drivers' and constructors' titles, and given the relative stability in the rules from last season to this, only complacency can undermine Mercedes this year.