Always when I get close to anything that moves and is sharp. I'm of the opinion that if something can go wrong it probably will for me. I'm not paranoid or anything but on the otherhand I want to be able to count to ten. As a pilot I've learned to stay ahead of the plane and that the two most important things are the next two things. I've had six "unscheduled" landings and broke my back once. Being careful is being smart even for a MAN. If it isn't plugged in it might not bite me.
Bob