I've seen that before but never with the sound on.
I nearly had a heart attack.
( Master Of Turnips. Only gays and morons believe in ghosts., Tue 9 Jun 2009, 3:00, archived)

It's not even a terrifying roar.
It's a feeble little whine, but still makes you jump the first time.
( Dave Trouser ; the people's choice - 75% agree, Tue 9 Jun 2009, 3:11, archived)