Standing at the ticket desk for GF at LHR last year, the pax in front of me was using veryoffensive language to the lady behind the counter - left me highly embarrassed!
Don't know what his problem was but I had suffered a fairly horrendous trip and was rather miffed at GF at the time, but no way would I have used that sort of language - even to a guy!
Hopefully in future, this sort of pax will be told to take a tube or a taxi!
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What goes around . . .
. . often lands better!