To play devil's advocate, any unnatural pattern would suffice. You could tap out 'shave and a haircut, two bits' and probably more people would recognize it. Bo

To play devil's advocate, any unnatural pattern would suffice. You could tap out 'shave and a haircut, two bits' and probably more people would recognize it. Bonus, you could tap the first part, and many people would probably think to tap the ending back to you.