I had a prop bite me once when I was careless working on a RC powered parachute. It was a large one built to haul a camera. Let me tell you that an 18" prop on a motor the size of a soup can will do some damage. That was 5 years ago and my right index finger is still numb from the last knuckle to the end and my finger is about 1/4 inch shorter than it used to be. It was a careless moment on a repair. 8 stitches on my index finger and 3 on my ring finger.
Here's the machine that bit me. That's a handycam on the front.
And here's the damage. REMOVE YOUR PROPS PEOPLE. TRUST ME IT'S WORTH THE EXTRA TIME.
If that pic is not appropriate please let me know and I will be happy to remove it. I was hoping a visual will drive the point home for safety.