When my oldest son was about 14 (he's 25 now..) he called me at work. This was how the conversation went...
Kid: "Hey Dad. You know how... like downstairs.. things start to get a little out of hand?"
TD: "Um.. I have no idea what you are talking about."
Kid: "You know... Your pubes... Anyway, I was trying to clean things up and.... I kind of nicked my sack and I'm bleeding."
TD: "What were you using?"
Kid: "Your razor."
TD: "WHAT??"
Kid: "You know, the electric one in the bathroom. For cutting hair?" (Talking about the trimmers, not my razor. Thank god.)
TD: " OH... Well son, you have learned a valuable lesson all dudes end up learning the hard way. DO NOT USE AN ELECTRIC TRIMMER on the pebbles."
Kid: "I was scared of using a razor, didn't want to cut myself."
TD: "How did that work out for you? Seriously, you'll be fine. Burns for a bit but you'll get over it."