Behind the Scenes: How they filmed the blood splatter in The Departed

A behind-the-scenes look at Martin Scorsese's The Departed (2006). This shot captures the filming of the pivotal scene after Captain Queenan is thrown off the roof by Costello's thugs and he splatters on the pavement.

You can see Leonardo DiCaprio (Billy Costigan) reacting in real-time as a special effects crew member uses a pneumatic device to spray him with fake blood, simulating the gruesome impact of the body hitting the pavement nearby. It's a great example of practical effects being used to sell a shocking moment.

https://www.youtube.com/watch?v=NiMPqcpG7UI#t=2m33s