Ireland's Potato Can't be Joked, Just Like... Marriage?

A surprisingly popular french fry joint in Causeway Bay. Interesting name - must be one big potato. And how did they transport it to HK? Oh well, much preferable to 'Ireland's Cabbage'. To their credit they must make damn good fries - there's alway at least a 20 person queue whenever I've happened by.

Anyway I was struck by the rather odd jack-o-lantern logo, and the even more bizarre inclusion of a lightning bolt. What does a jack-o-lantern have to do with fries (or lightning)? Ours is not to question, laddy - just eat your fooken chips. Also the slogan is one for the ages:

There are two things in the world that can't be joked: 1. marriage 2. potato