I’m a big fan of Hannigram in airports or hospital waiting rooms finding a difficult puzzle of some kind (sudoku or crosswords or even maths) and then conversing seriously in their own little bubble while figuring out the answers. Imagine how much stimulation their brains need and how fast they think—they participate in a neighbourhood “treasure hunt” and maybe Hannibal needs to be very curious about the “treasure” to take it seriously, but they always win.