yes I have. while going to Vishakapatnam on 15th October 2000 with 15 of my relatives. A group of 8 people boarded the train Coromandel express(2841 Up) from Kharagpur , & demanded to us that berth nos from 25-32 of Coach S-7 were theirs. But incidentally as I said , berth nos 17-32 belonged to Me & 15 other of my relatives. The train Departed Kharagpur & the Kharagpuri Group of 8 people kept on arguing . Ultimately what I found is the situation of next day ticket. The 8 people who boarded the train at Kharagpur , were supposed to board the train next day i.e 16th October 2000. The group realised their mistake & after requesting the TTE , they got down at Contai Road.