How do we prevent the occasional bad upvote?
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**We don't need to.**

[That question](http://superuser.com/questions/955140/i-like-my-best-guy-friendd-best-friend) was fairly quickly closed. At time of closure, I saw that it had only one positive upvote, with however many mod flags and vtcs. 

Perhaps - as I speculated in a comment - someone had seen the [previous iteration](http://superuser.com/questions/955136/guy-issues-liking-a-best-guy-friends-best-friend) and voted it up for the humour of it being reposted under the correct tag that time around? Or perhaps it was out of sheer bloody-mindedness. Or perhaps there was another shill account (that was going to do a spam response to that bait) with sufficient rep to upvote?

Without meaning to sound condescending, the usual approach of "edit, comment, downvote, flag, vtc, bring it up in [Ask a Super User moderator](http://chat.stackexchange.com/rooms/114/ask-a-super-user-moderator)" *(delete as appropriate)* works just fine :-)

Upvoting isn't worthless, as there is only a limited amount of votes *per diem* in any case. If someone wants to throw away valuable votes, let them- they'll quickly be drowned out by sensible folks voting the 'right' way.