It's a Douglas Adams thing, isn't it?
(
Quijibo Esq. BSc. May contain traces of nuts,
Sat 15 Mar 2008, 11:02,
archived)
No, it's definitely "Going Postal"
It relates to the chap in the Post Office who collects pins.
Hurrah, my brain is free.
(
Mod Edit,
Sat 15 Mar 2008, 11:10,
archived)