I've had so many over the years but I had a Buck that served me well and my last "good" knife was a smith&wesson fighting knife. Worked great for cutting throuhg sidwalls when dismounting a tire.

Where I work now if I'm caught with a knife I'm terminated on the spot so I'm not allowed to cary one, which is a total PITA to say the least.

Of course my favorite was the Rostfrei switch that I used to carry in Highschool.

Yes, I was one of "those guys" that never got in trouble but for some reason I was always in the middle of the crap.