There is only one situation where you need to lay it down.
It happened to me when I was a teenager.
There was a local deliquent named Damien that lived up to his name.
He strung barbed wire neck high across the trail.
I locked up both wheels and slid under it.
Got him back, though. He was riding his bicycle down the road,
I came up behind at about 40mph and smacked him in the head.
Knocked him off his bike and almost broke my hand.
Ah, memories.