I saw this thread a few days after a very close (8 yards) encounter with a mountain lion in the Zuni Mtns, NM.
I was turkey hunting (stalking and chirping) at the time, and watched the lion for about 2 minutes at that distance before it seemed to finally identify my totally camo position (un-gloved hand to take pic seemed to give away my postion) and started to crouch and lean in closer. I yelled and fired over its head to scare it off. BPL inspired gear on the hunt was a SPOT, Gtx roclite boots, 7oz. rain gear. This was the second lion (different location) I had seen in 4 days, and the second chance inspired me to take the chance, remove my finger from trigger, and try to get a photo. Much like Kat's experience; one of the best adrenaline shots in years!
Gun barrel @ bottom of pic, lion at center of pic @ 8 yards. Pine cones and needles in foreground show relative proximity.