This is the funniest thing you'll see today. Conor McGregor's father Tony uploaded a non-ironic rant about having no room to carry coins in his designer suit.

McGregor (59) filmed himself complaining about getting €17.30 in change after buying a train ticket.

“I am not too plussed," the fighter's father said. "Just to let you know about my travel experience on the DART this afternoon, that’s the rail system of Dublin city, it’s called the Dublin Area Rapid Transport, something like that."

[ed note: it's Dublin Area Rapid Transit.]

“When I got to Lansdowne Road station I tendered a brand new crisp €20 note into the automatic machine looking for a single ticket to Dun Laoighaire," he continued.

“They had the bloody cheek to give me back coinage, €17.30, and a miserable little one-way ticket. They gave me all that coinage. I have no room to put those coins anywhere. I wear a slim-fit, hand-fitted Hugo Boss suit.”

Despite McGregor having a mere 5,000 followers - compared to his son's massive following of 24 million - the video quickly went viral.

A tongue-in-cheek fundraiser was set up by comedian Emma Doran to help the Dublin man get a leap card (the equivalent of a metro card.)

Irish Rail had an even better response.

“We’d recommend that Mr McGregor resolves the problem by purchasing a leap card," a spokesperson told Independent.ie.

“If money is as tight as his trousers, he’ll save on his fare as well. You can save up to 31% using a leap card."