The Black Button

The Black Button
The Black Button is a flash game made by Albino Blacksheep. It tells you to hold a button for 30 seconds while saying that "you never can hold the button this long". However, if you made it to over 30 seconds, a picture of a clown with his mouth open appears along with a loud scream.

Links
NOTE : The following game contains a screamer.
 * albinoblacksheep.com/games/blackbutton