LOL

I faced similar ones in the past and was also wondering if it's just coincidence.
BTW you know nothing about captchas

if you haven't faced Rapidshare's ones in the last period of that site great popularity:

It wasn't about checking if you're human, it was more like test of your skills - survival of the fittest

that one is just horrible to fill out by, similar like the horror captchas where you have to support traffic AI teaching,
but the one got is asking for violence.