When Crew Members didn't hear that lock up was called and realize they're walking into a shot...

1stassistantdirectors:

http://25.media.tumblr.com/c52a2ceb64c5d3d23e704760e8e608d5/tumblr_mjtuu8oMfG1qeenmqo3_250.gif

This was me when I was shooting I am Monster and my co-director was directing a scene and I thought she yelled cut and I started to follow the actor out of the hallway we were in (and I was out of the shot for) only to realize, “OH SHIT! STILL FILMING!”