I got bitten by my yellowbelly when he was around 400g and I was checking his enclosure for an uneaten mouse running around. It left a tiny scratch on my knuckle. I won't lie that I was pretty happy to have finally been bitten and knew what it felt like, and even more happy that he'd eaten the mouse!!

And I agree that it does feel a lot like a "flick"... at least from a juvie ball.