http://www.break.com/index/biker-slams-into-his-buddy-2116992

or this guy either;
http://www.break.com/index/two-guys-on-bike-wipeout

You don't always get a choice about the other riders around you.  Go up a popular section of mountain road on a sunday morning when every man and his 1098 are out for a hoon and if you're sitting on the speed limit you will get guys like that trying to share your lane in the corners. 

I hate when people ride too close. That guy got seriously lucky that he slid right between 2 of those poles.