Boechera rollei on the Pacific Crest Trail, south-southwest of Cook & Green Pass and east of Red Butte, Siskiyou Mountains, 41.9326 -123.1499, Siskiyou County, California, 24 Jul 2008.
What started out as an orderly morning orgy on the tip of a mustard leaf rapidly devolved into an epic fail as males continued to join the pile. The entire ball (at least two females in there) went over the edge, and for several seconds was held entirely by the legs of one male. After he let go, everyone dropped to the ground and a few extra-focused ones continued mating.