Syringe Pen - Stab people with it to poison them.And of course, as Subject said, non-lethal versions of a briefcase, umbrella, cane, and pen.
Spy stuff right there. /Support
Someone should make a prop varient that is just for a weaker whack than the regular weapon. Then someone should host a server where there is one person trying to assassinate the president. Guards try to figure out who has the disguised weapon so they can take them out.