The favorite CAPTCHA test

[newebster]

I am not really good in math but I think the math problems are less annoying than the distorted text. However, my 'favorite' is the random questions, like that asks you to mention the last name of the US President.

[LaNino]

I like the ones which require you to ask a simple question, like how leg a tiger has. But sometimes I wonder if I have to answer '4' or 'four'.

[Hostfinder]

As a website user/visitor, what kind of CAPTCHA test annoys you the least? I hate the distorted text. Some always get a hard time reading the text. I prefer the math problems (not the complicated ones though LOL).