Poobutton.com

PooButton.com was a shock site created and hosted by ShockSiteList.com in October 2005.

The website displays a red button with the text "poo" within the middle, along with the text saying "Press The Poo Button...You know you want to.", the first time the button is pushed, it makes a fart noise and says "Ooh delightful! Press it again.", Pressing it for a second time makes another fart noise play and the text "Haha! Nice one! Press it again." appears. The third time the user pushes the button will display a GIF of somebody defecating onto an unadorned woman's, followed by Scatman John - Scatman(ski-ba-bop-ba-dop-bop) playing.

Link
NOTE : The following shock site contains graphic content!
 * web.archive.org/web/20080701055625/poobutton.com/
 * Emulator of Internet Archive: archive.org/details/poo_20201125