Are you the regular office prankster who has plenty of tricks up your sleeves? If that is the case, then you might want to add another “weapon” to your arsenal, which would come in the form of this $4.99 Disappearing Dagger Gag. This is a classic Gag Dagger which is more or less guaranteed to have you jump back in horror – after all, the blade itself will descend into the handle when pressed against a surface. Not only that, it will look as though you have just sunk the knife so deep into whatever or whomever it touched, more than just a couple of folks will end up screeching in horror. Of course, it helps if there was fake blood added to the entire scene, but that might just prompt a call to the police and you would have plenty of explaining to do after.