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Countdown
Countdown is a screamer video uploaded to Youtube on Apr 27, 2009 by Steven Anderson, in which the timer was set at 60 seconds.
Video
The video starts at 60 seconds of the timer. After 30 seconds had passed, the theme song from the American gameshow called Jeopardy plays. When the timer runs out, the buzzing alarm plays for 2 seconds, then Regan MacNeil popped up with the girl screaming sound. The screamer itself is not scary at all as the screaming sound is generic and it isn't so loud(which makes your ear gonna bleed.)
Link
NOTE: The following videos contains a screamer!
youtube.com/watch?v=9-N2N9QquSM