E-vote advocates still don't get it...

I've messed up a ballot twice and no one batted an eyelid. Admittedly, that was with a NSW senate ballot paper which was about a metre and a half long and had more than a hundred candidates on it . . .

Generally speaking, if you're doing something odd and the polling place workers think it's suspicious they'll just ask you what's going on. If your actions are against the law, they'll call you on it and depending on the offence they'll do something about it, but this is a vanishingly rare occurrence.