Only in Wyoming?

HRi told me about his experience in Wyoming.
Not quite sure whether he went there for work or collage.

At this time of the year the population would eagerly wait for the arrival of the 4th. July.

There are celebrations across America.... which mean picnic and fireworks.

He was in Wyoming on the 4th of July and had a picnic, laid on the grass watching the fireworks.

While watching the sky with explosions of various colors, the people would utter "wow" and "wah" in amazment as soon as the fireworks exploded into vibrant colors EXCEPT for the color PURPLE when everybody (I meant everybody) would shout:

PURPLE!

That was rather interesting, I thought.