My ratio is a bit higher - 2 in the space of a year. One (over and over again) at the Portal last July, and another dumpster-diving in a Mammoth condo garage the previous summer. The one in Mammoth was an extremely close encounter. The condo's dumpster room was right next to the elevator and I had no clue the bear was there. When I pressed the call button for the elevator the "ding" startled the bear and he hightailed it out of the dumpster, brushing by me as he scooted out. I didn't even realize it was a bear till he got about a dozen yards away and turned to look at me accusingly. But that type of thing isn't at all unusual in Mammoth.
Agree wholeheartedly on the smaller critters being the biggest threats to your backcountry peace of mind. Marmots and mice have been the biggest culprits for me. My favorite trekking poles no longer have padded wriststraps due to a marmot. During a climb of Cathedral Peak last year I had balanced the poles on the very top of a bush at the base of the mountain before we roped up and started ascending. When we returned a few hours later I found that a damned marmot had somehow gotten the poles off the bush and chewed away the sweaty (salty) padding around the wriststraps. I had left my hiking boots around the same bush after changing into rock shoes, but he left those alone. I guess they were too unappetizing even for a marmot.
As Joe alluded to above, mice wrecked our camp at Consultation Lake during the same week. While we were up on the mountain mice located our ziplok trash bag, invaded it, and chewed everything in it into teeny-tiny bits. When we returned that evening our camp looked like it had snowed every possible color.
When I was camping in Death Valley a few months prior to that with my buddy John (catpappy), he somehow left a package of cookies in his tent while we were away hiking. When we came back he found a neatly-chewed mouse hole in his 'spensive Black Diamond single-wall tent, along with a mess on his tent floor.
Guard against the bears, but keep your sights on the smaller critters - they'll cause the most trouble.
