Three Scots and three Irishmen are traveling by train to a conference.

After the conference, the Irishmen, thinking they’ve cracked the Scots’ trick, buy just one ticket for the three of them. The Scots, meanwhile, don’t buy any tickets at all. The Irishmen are puzzled but board the train. The three Irishmen squeeze into a bathroom, mimicking the Scots’ earlier move, while the Scots cram into a different bathroom.

When the conductor comes by, he knocks on the Irishmen’s bathroom door. “Ticket, please!” The door cracks open, and an Irishman hands over their single ticket. The conductor takes it and moves to the Scots’ bathroom, knocking again. “Ticket, please!” To the Irishmen’s shock, the Scots’ door opens a sliver, and an arm extends—not with a ticket, but snatching the Irishmen’s ticket from the conductor’s hand. The conductor, none the wiser, moves on.

The Scots ride free, and the Irishmen are left ticketless, fuming in their cramped bathroom, outsmarted again. “Clever bastards,” one Irishman mutters, as the Scots chuckle down the hall.