This weekend's road racing in Europe was a bit of a bang-up session, with crashes at the start and shortly after in Formula Renault 3.5 and Formula 2. These are both classic illustrations of the red mist getting the better of the drivers' abilities, and great examples of how not to start a race.
Jon Lancaster's crash from pole position into Daniel Ricciardo's car right at the start of the Formula Renault 3.5 is also a fantastically good example of the price of getting too aggressive in diving toward the dirty side of the track to block your competition.
Kazim Vasiliauskas' crash at turn 1 in Valencia is a simpler case of trying to shoehorn cars three or four wide into a turn that will permit two at most, and getting punted from behind by another driver coming in too hot.
Classic racing mistakes, and lessons well worth learning.