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Here's an old knife fighter's trick. Get a riveted folding knife that fits well in the hand and in which the top of the blade can be easily grasped between the thumb and middle finger. Put some graphite on the pivot joint and work the blade open and closed for until the resistance is almost gone. A knife so conditioned can be opened almost as quick as a switchblade by the mere use of the two aforementioned digits.

Some of the newer knives with screws instead of rivets might lend themselves to a "trigger job" in lieu of the graphite.

I am much more worried about getting diced up by a razor box-cutter

Slashing with a razor sharp knife is a proven technique among the street-wise. You want to kill, you stab. You want to be left alone, you slice and dice. The horror of seeing their own flesh flayed open is just too much for most people to maintain focus. Now, with the ready availability of box cutters you don't even have to bother with a "real" knife. On account of their efficacy, I would not be surprised to see box cutters singled out as prohibited weapons in some states.

The karambit appears to combine elements of the box cutter and the knife into one tool:


If you find yourself in a real tight without a real weapon, a beer bottle broken over the bar or your opponet's head makes one heck of a good impromptu slashing instrumentality. I'm sure some here will recall the old Houston icehouse protocol of yore. Airline, Market St., Telephone Road, Uvalde Road, Old Highway 90, Black Cat Ridge across the San Jacinto River from Humble, etc.