I used to fight a lot in high school, like fisticuffs at the flagpole and all that bullshit.
Everyone knows that one macho jackass in school who always has a hunting knife with him and talks about how "if anyone ever tries some shit with me i'ma gonna...". I get the feeling a strong majority of the people bragging about carrying shit for fighting aren't using it, just playing out some Steven Segal scenario in their minds of how they would leap from their still coasting ped and pull a switchblade out in midair.
Truth is, fighting isn't about handling your weapon or boxing technique, it's about being able to take a hellacious beating. In my experience, most people will threaten to fight you, but if they aren't drunk, there's a 98% chance they're full of shit and knife or no knife, they're gonna move on eventually. The other 2% are going to be crazy, and fight you even if you've got a knife, which means you better pray he doesn't get that knife away from you.