Without actually knowing what "phonetics" meant and probably not even knowing the alphabet, I was able to think to myself that "p" was a harder version of "b" as was "t" to "d", "k" to "g" and "s" to "z".
Sen vere scii, kion signifas "fonetiko", kaj supozinde eĉ sen kono de la alfabeto, mi kapablis klarigi al mi, ke "p" estas pli malmola variaĵo de "b" same kiel rilatas "t" al "d", "k" al "g" kaj "s" al "z".