Are extreme, baseless bouts of excitement normal?

Occasionally (probably about once per month), I experience a spell of extreme excitement! They are not after an accomplishment, a win, or anything in particular; these spells occur for no good reason.

What happens is this:

I am suddenly so overwhelmed with excitement that I spend a half hour acting like a nutcase. These bouts usually begin with my arms in a position similar to this (except I have a gigantic smile instead of that weird face). In that position, I start shaking them vigorously and shout, “Eeeee!” I jump up and down, do gymnastics, squeal, scream, make up fake words, roll around on the floor, and giggle hysterically. All for no good reason. This behavior usually lasts between 20–30 minutes, and then I go completely back to normal.

Some things to note: What I do when I enter an excitement spell is completely under my control. If I am at work when they occur, I could completely suppress it. But when I enter an excitement spell at home, I let myself go with it because it’s kinda fun to feel like that, and who cares if my boyfriend and cats think I am a goofball? (My boyfriend thinks it is hilarious when I act like this, and my cats stare at me inquisitively.)

The only other person I have seen these excitement spells happen to is my mom. I remember her sometimes acting like a goofy excited person when I was a kid.

But then again, no one aside from my boyfriend and my cats has seen me during one of my bouts of excitement. So perhaps they are normal? Does anyone else experience these or have any knowledge of what may explain them?