update: i showed my cousin this, and evidently i had a factory defect childhood because i never learned this little tap/cup/beat thing. normally i would blame it on growing up in a Filipino household (the same way i do when i get common american colloquialisms or customs wrong), but clearly this time that will simply not work. pretty sure i’ve missed the boat on this one because i didn’t learn it during the appropriate Piaget stage of cognitive development. opportunity lost.