A friend who recently converted to SPD clipless pedals has managed to crash & burn at least once on each of the past few group rides. I usually carry a small first aid kit with Neosporin and 4" square bandaids for road rash, but last Wednesday I had mislaid it, and took off without it. I did have my tire patch kit, and offered the use of it, if he didn't mind the sandpapering part...

I bet it would've worked...