Hitting the wrong button on a phone is less of a problem that it might appear at first. An up-vote results in an "unvote" link being shown and a down-vote resul

Hitting the wrong button on a phone is less of a problem that it might appear at first. An up-vote results in an "unvote" link being shown and a down-vote results in an "undown" link instead, so you can confirm that you hit the right button and undo the vote if it was wrong.