"Waffo doggee bak?" he asked me.
"Huh?" I replied.
"Waffo doggee bak?" he repeated.
Then it sunk in. He was referring to the bag he was holding and he was asking me what a doggy bag was for. Obviously they ordered way more Prime Rib than they could eat and the restaurant gave him and his colleagues doggy bags to take the prime rib home. A light went on in my head and I bowed elaborately to the Japanese and gave this response:
"Ah so! Ancient American custom. They give you doggy bags and then you give to first person you meet."
I held my hands out and the Japanese enthusiastically deposited their doggy bags into my greedy hands.
"Ah! Tank you berry much," they exclaimed in gratitude for the honor I bestowed upon them for allowing them to give me their doggy bags.
I then quickly proceeded home and had the best Prime Rib dinner (with lots leftover for the next day) that I ever ate.
Funny story!