This reminds me of an amusing long standing misinterpretation of local culture by my Taiwanese mate. Every Friday, we'd go to the same pub, where a live rock band would entertain us all. Every week, the band, whichever band it was (they all did it, it was the custom) would start a particular song (can't remember what it was) that featured a few notes on guitar, then a pause while everyone shouted a certain abusive word at the band. They'd bang out a few notes again, then again we'd all in unison shout the same naughty word. After 2 or 3 goes the song would get underway. This always happened about 2 thirds of the way through the set. This was the custom. Then one night, a band broke the law. They finished early. We all thought they were teasing so we all obliged with the customary slow, low chants of 'more'. But no. To everyone's dismay, they packed up and went. My Taiwanese mate was as stunned as all of us, probably more so because he was still learning our local customs and this was new for him. He turned to me seeking clarification, and meekly said 'we haven't even shouted Ambags yet'.