Newkid: schoolchild flicks ruler on edge of desk, sliding it upwards whilst it vibrates to invoke comedy noise, teacher reprimands the miscreant, fellow pupils laugh, pupil in question launches Hiawotha (?) style, secret indian attack on said teacher, involving the launch of an open carton of capri-sun.
Ibid: Illustrating the important point that, when you and your mate decide to do comedy diving into the pool, it is absolutely vital you make sure there is water in it first.
Kim: Proving that the essence of comdedy is, in fact, not........timing, but being funny.
rab: I believe this is one of the out-takes from Secretary.
Martha Farquar:
Testing a 19th-century glider before getting over-confident next to a cliff?
MoA: The gory, yet amusing, finale to a medieval self-catapulting contest.
Kevan: A prankster snipping the attached end of a bungee rope.
Ibid: The only sound effect I can hear is the Grim Reaper sharpening his scythe...
Simons Mith: [Ibid] That explains the Tip tip squeak then.
newkid: [simons mith] keep going! i swear i saw it's hand move!
Darren: I personally think it's the sound of someone falling on some gravel, which turns out to be quicksand. However, they fall through the quicksand into a baseball game - as the ball. The "Tip tip squeak" is the result of random neural discharges in the brain, which has been otherwise destroyed by being hit by the baseball bat.