#4 The trio blast - 2012 Belgium Grand Prix
This was also one of the terrible accidents in the Formula One history which victimized Romain Grosjean, Lewis Hamilton, and Fernando Alonso. Grosjean raced past Hamilton and made contact with the Mclaren in the maneuver which lead to a horrific crash but in midst of all these, Alonso got unlucky. The Spaniard had no idea what was going on and in a fraction of a second, his car was in the air and suffered major damage as a result of Hamilton crashing into the Ferrari. This occurred on the opening lap on the very first turn. All three were given medical assistance as soon as possible and were fortunate enough to walk away without any injuries. Not often do we see an accident as deadly as this in formula one.
Video: Crash involving Grosjean, Hamilton, and Alonso, 2012 Belgium Grand Prix