Yeah my mate was going about 15-20 id say down a hill, just was riding, just went to hop up a curb, sounds silly but back wheel just tapped it and because he was going fast flew straight over bars i had to go chase bike because it was bouncing into road and he just got up and wasn't that bothered, took a big chunk out of palm of his hand and had loads of l;ike friction burns, but still managed to make a vid with us that day. Ive pulled a muscle in my back about 5 days ago and Ive only just been able to ride today but it still hurts, hope it goes soon. Ash~