Ooops, I took the wrong €20,000 from the bank.
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Just how does one legitmately acquire a return ticket and use it in the wrong direction?
If the ticket was bought in Dublin, surely one would be using the outbound "from Dublin" part of the ticket when leaving Heuston.
If the ticket was bought away from Dublin, surely one would be using the return "from Dublin" part of the ticket when leaving Heuston.
Some people will try to use both parts of a return ticket to travel in the same direction twice, but this tends to be against the rules, to prevent people fraudulently claiming that they used some other method to return.