why this akka and anna are looking so wierd.....

Yesterday me and my sister were seeing an old film song from the movie mann vaasanai. My niece (Swarna Kamakshi) was also with us. The song was "pothi vacha malligai mottu". After the first para, she asked my sister "mommy, why this akka and anna are looking at each other like this", my sister replied "they are in love kannama". Swarna said "NOOO, they look so wierd, like mad people". I interrupted and said "thats why they are in love". My sister didn't expect this and started laughing. Swarna also joined us without understanding why we were laughing.