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The best way to say yes when you're being asked for something and you're not in the mood to be polite
'Ja zwanzig' when the waiter asked if I wanted another beer and I was already drunk.
'Ja zwanzig' when my friend asked if I wanted to go to the mall and I just wanted to go home.
'Ja zwanzig' when my mom asked if I wanted to clean my room and I was too lazy to say no.