When I worked for National Rail Enquiries I received a call for train times from Blaenauffestiniog to Llanfair PG, obviously a wind-up, a bloke in a pub with his mates listening in. What he didn't know was that I had recently begun to teach myself Welsh so understood immediately and gave him details in Welsh. He was a non-Welsh speaker and I could hear his mates jeering at him in the background when they realised he had bitten off more than he could chew.