"Jumping Jehosophat" and "Yumpin' Yiminy"--Why the jumping?

[Douglas G. Wilson]

>This is a follow-up to the brief "jiminy crickets" discussion. Why do
>(some) Scandinavian Americans say "Yumpin' yiminy?" Or is this just from
>the past? Specifically, why the "Yumpin'" (jumping)?
>
>     Similarly, there's "Jumping Jehosophat!" Is there any reason why he's
> referred to as "jumping"? Am I missing something obvious?

My unsupported speculation: just a nonsense augmentation to make the
interjection a little more weighty.

-- Doug Wilson