This is why your parents tell you to go to college, so you don’t end up as the assistant/target of some half-assed carny knife thrower.
Here is what you need to watch for:
1:17 — As the kid is holding a card the thrower almost cuts off a finger
1:30 — Might as well make the hands match
3:15 — Looks like that loose strand of hair is bothering the thrower so he attempts to trim it. Or he was trying to murder this kid.
4:45 — Hiding the evidence.