You know as a kid in the netherlands we always do this, well at least people around me. So youre going full speed on your bike to your friend and then act like youre gonna run them over but then stop so you scare them. I once did that to my friend who was also on his bike and was also coming full speed at me, instead of us both going other way so we dodged he went to where I went so we had a huge crash and he broke his arm and leg, and yet I had 0 injures, just couple scars. I've actually never broken any bones.
I also once thought when I was 9, I was superman soi got up on the side of the couch and jumped off and tried to 'fly' and then I landed on my had and had to go to hospital, in the end nothing wrong. I got better in 2 days.