Dot Pat files
I was leaving one Dutch company and my replacement chatted on the phone to a customer about Dot Pat files. My Indian English junior said, "Did he just say Dot Pat?", and I replied, "Aye, noo ye'll miss me".
I'd taught the English Indians a lowland Scots dialect so we could chat alone when the Dutch broke into Dutch - supposedly an English speaking company. I learned a wee bit Punjabi. And also how to freak the Dutch out - just wait until they've finished their chatter then say 'waarom niet'?