1. A computer system configured to validate CAPTCHAs, the computer system comprising: one or more hardware processors programmed, via executable code instructions, to implement: a CAPTCHA generator module configured to: determine a phrase containing a first combination of one or more words that, when perceived together, sounds like a different second combination of one or more words; and generate CAPTCHA user interface depicting: the phrase of words including the first combination of one or more words, and at least two options, at least one of which makes sense within the context of the phrase; a human validator module configured to: receive a selection of at least one of the options associated with the CAPTCHA user interface; determine whether the selection makes sense within the context of the phrase; and transmit whether the selection makes sense within the context of the phrase.