Paying Attention

Today I went out shooting with a bunch of friends. We went to San Juan Bautista where I've shot before (at the mission). Today I was in the buildings that were part of the state park. I'd set up my camera to take a few exposures of a scene to practice blending them in Photoshop in order to light up the room and not blow out the windows. As I was running through the series of shots, I never noticed that my friends had gathered outside the window.....no I need to not only figure out how to blend the exposures but to eliminate them entirely.....LOL.