Including Tacks?

Including Tacks? This kid walks into the pharmacy: "I've a hot date tonight, a sure thing, and my buddies said you could fix me up for it." "What do you want?" "Well, it's a hot date, man. A sure thing? You know..." "What do you want?" "I need some protection, alright??!?!" "What size?" "Size? I dunno... Whatever is considered average I guess." "That'll be $2.35 including tax." "Tacks? Tacks? I thought they stayed on by themselves!"