There is a reason why helmets are compulsory pretty much everywhere now for motorbike riders. If you had any doubt about what they can do for you, have a look at this guy.
Following an uncontrolled dismount from his ride, our friend met the asphalt with his head and managed to split his scalp. I have no information as to whether he sustained other injuries or if his skull was fractured.
It is interesting to note the massive clots forming inside the split flesh over the bone. Head wounds are notorious bleeders, even a minor cut pisses out blood. I can only imagine romper stomper here would have had blood cascading like a human chocolate fountain.
I’d have liked to have seen the injury before being cleaned up. I’d also like to see what would happen if you yanked down on his ears.