[daikokunyo]

Yeah, probably. I consider myself a very nice person but it never even crossed my mind to say thank you to cashiers until I met that friend :P And she was fretting so much because she said it was a cultural requirement to say thank you. Kind of like sticking your pinkie out when you pick up a tea cup, or something. So I'm like OMG I only have an instinct of how to behave with my own culture.