YSK that putting your napkin/trasg inside your cup at the end of a meal at a restaurant is not helpful or polite to the staff.
from /r/YouShouldKnow
YSK認爲，在餐廳用餐結束時將餐巾/茶杯放在杯子裏，對工作人員沒有幫助或禮貌。
YSK認爲，在餐廳用餐結束時將餐巾/茶杯放在杯子裏，對工作人員沒有幫助或禮貌。
YSK that putting your napkin/trasg inside your cup at the end of a meal at a restaurant is not helpful or polite to the staff.
from /r/YouShouldKnow