not sure that it's in any way cheeky but solitaire set (the wooden board and marbles... amazingly popular with all sorts of cool and nerdy kids and adults). Big hooter for his bike is either very good or very bad idea, depending on the child. Sam Stern cookery book (written by 15 year old boy... think Jamie Oliver for teenagers) & apron to go with it.
STocking Fillers etc for DS1 tend to be things to stop him smelling like a teenage boy <remembers he's not even a teenager now> - shower gel, hair gel, shaving stuff, macho shampoo etc. Have even gone for that rank Lynx stuff in teh past - don't recommend.