Exclude a specific page from Captcha ? Captcha on all nodes except one, possible ?

Hi,

Do you know how I could keep a captcha enabled on the whole site but disable it for a specific page where people could comment without captcha ?

I am fighting with spam and captcha for years and when i need to set it difficult i would like to keep a page on my website without captcha, a page where i accept to be spammed but where people who really want to contact me could write me as a last chance (if they have problem to pass the captcha on other forms/pages).

Thank you for your help.