When I asked an ex-pay Scot living here in the U.S., why he returned to Scotland with regularity each 5 years, I was told that Haggis season in the Highlands is only every 5 years and he has to plan ahead to have sufficient supply on hand. I've had one he brought back, and although weird looking, didn't fast to bad.
I asked him if he ever wanted to have the head of a big male Haggis stuffed to hang above the fireplace and was told it's illegal in Scotland and applies to the U.S. under international treaty… go figure! Learn something new all the time...