This is at the easter sunday new hope church service last week on easter sunday.  When we were outside i noticed smoke was billowing out of the entranced doors.  When i realized no one was running or screaming i walked in and realized there was a smoke machine.  I was looking at the professional lights set up in the arena and realized why or maybe why there was a smoke machine.  You could see the spotlights ray of light because of the particles from the smoke.  Usually when you shine a flashlight on something or someone, you can see the end of the light, but you cannot see the beam of light unless it is a really bright light.  Also when you look at the light projecting a movie at a theater, you can see the beam of light because of the dust particles in the theater.  As the light hit the smoke particles the light reflected off of them allowing our eyes to see the path of the lights in the arena.  I guess they created this effect so they could put on some kind of a light show to make the service more of a concert so it would be exciting and interesting instead of a boring chapel service. I don't know if this is physics, but i thought it was cool.