It's not really a sound but it goes like this in my head as I'm about to eat it! This is gonna hurt, this sucks, oh shit here it comes, and then when the pain goes away from the wreck...I think it's time to go home lick my wounds and drink a beer...or 2...or 12!!!
Well origninaly i would have said the good old pssssssss flap flap flap of a pucnture but i now would say the noise of your frame snapping and then you skiding along on your back tangled in it.
When you fall off everyone runs up to you and say you orite? you orite? you orite? you orite? you orite? you orite? you orite? you orite? am like Fu** off leave me to catch my breath