He's a bloke with a few drinks in him, 31, 61, 101, it doesn't matter, he's still a boy at heart and will do things, that on sober reflection, he would/ will/ does regret. Most of us, if we're honest(me definitely), have done something similar in our pasts, hopefully not the future but no guarantees.
Being a Gosford boy, I'm wondering were this happened; I'm willing to speculate, he was probably rolling down the Skillion at Terrigal and came up against the sandstone landscaping blocks at the bottom.
Get well soon Thommo and I hope you have an injury free 2020..