Imagine if after forty years in the same job a young upstart came into your office and decided to nick your seat.
Well this is what the SNP tried to do to Denis Skinner today, the veteran MP for Bolsover, who has guarded his seat on the lowest backbench row of the House of Commons for many a year, was not amused.
In this the SNP are already employing some of the old tricks of the Irish nationalist MPs who long ago left the green benches. Parnell, the one time leader of the Irish nationalist party, used to sit in awkward places in the Commons (and instructed his MPs to do the same) to harry unionist politicians of the day. Indeed most of our modern parliamentary procedures were invented to deal with the Irish Nationalists obstructing parliamentary business after they were elected to the chamber as a bloc in the late 19th century. The guillotine for example, which cuts off debate after a certain length of time, was invented for precisely that purpose.
It remains to be seen whether the SNP prove quite so troublesome. In the meantime Mr Skinner may wish that new SNP MPs were a bit more like Sinn Fein parliamentarians and just didn't sit anywhere.