“Oh, you mean this thing?”
“Yeah, what’s up with that scar!”
“I got it in a shark attack in Australia, yeah, it was quite terrifying, but I just pressed the eyes of the shark and he let go.”
“Wow, that’s amazing! And how about that?”
“Wow, and that?”
Let’s face it, it’s just not as cool to tell anyone that you got that scar when you used a big knife for slicing ice cream, so make it up. Really? Yeah, but make a joke about it at least. So when people ask you, you have a funny story to tell.
Can't argue with the coolness.
So make up that scare cause and you’re “normal”.