CAPTCHA is a Voight-Kampff Test
I tend to get bogged down in minutiae when faced with one of these. Take a look at the following example:
Is it not debatable that that word could spell either “pctding” or “potding?” The p and the t have holes in them; maybe the second letter is actually an o with a hole in it, cleverly disguised as a c. The word might even be “pording,” you never know. And so I guess wrong and the computer gives me back a snippy little message that I have to try again, with a new set of letters that are no better.
There is clearly only one reasonable explanation for this. I must be a replicant and don’t know it.
(Image courtesy of alatissian.com, who apparently makes these sort of things.)