One. A friend at work was asking for small items for some kind of charity auction he was doing. I gave him a $10 Kershaw Swerve, the 3Cr13 Walmart version. I wouldn't have given that away if I wasn't planning on upgrading to the 8Cr13 assisted version anyways, and he apparently end up auctioning it off for $40.
Normally though, I don't give away knives. Most people I know personally don't care ANYTHING about them, and I'd rather give them something they are interested in. My dad and sister understand the usefulness of a pocket knife, but they find what they already carry(a Case Mako and an SAK respectively) all they need.