TLDR: “Deadly” is a relative term, especially given how creative some fiction writers can get with their stories. Gimmicks, on the other hand, are another matter.
The Turkey Baster from Hell

The replaceable cartridges are pictured next to the WASP Injection Knife. Gun not included. (Image via WASPKnife.com)
The world of knives might seem mundane if you don’t know where to look. Knives cut things. End of story. They’re pretty interchangeable from one to the other. Nothing to see here, folks, right?
Not so fast, chump, especially when there are things like the WASP Injection Knife, which made its debut in 2008 as “the world’s deadliest knife.”
Those outside the knife world might not have heard of it, likely because no one they know owns one given that $500 price tag. Why the steep tab? I’ll let this description from KnifeCenter do the talking: Continue reading