Captcha images don't prove you're human, they prove that you're American:

Taxis in my country are generally black. I’ve watched enough movies to know that all of the ones in America are yellow. But in every other country I’ve visited, taxis have been a mish-mash of different hues.

This annoys me. Will Google’s self driving cars simply not recognise London’s Black Cabs? Will any yellow car in the UK be classified as a taxi by the infallible algorithm? Will Google refuse to believe I’m human simply because I don’t know what a Twinkie is?

Before sticking a comment below, riddle me this – if something costs a half-a-crown, and you pay with a florin, how many tanners will you get in your change?

https://shkspr.mobi/blog/2017/11/captchas-dont-prove-youre-human-they-prove-youre-american/