I usually don't palm the road when I crash. One time I did though, was when I didn't check my front QR, jumped off curb and into a swath of cinders. Front wheel ejected, fork dug into pavement and I went in palms first. I had a cinder (almost a 1/4" diameter) submarine under my skin for about a half inch, so I had to X-acto it outta there.

Wore summer gloves for a little while after that but don't bother these days. They don't put cinders on the road here, anyway.