[A Navy Vet]

"How do you guys keep your heads from spinning clean off?"

With their thoughts "rattling" around inside their heads, it creates a stabilizing gyroscopic effect.

[Grampa Dave]

Navy Vet posted, With their thoughts "rattling" around inside their heads, it creates a stabilizing gyroscopic effect.

If you replaced thoughts with rocks, it would be a little more appropriate:

With their rocks "rattling" around inside their heads, it creates a stabilizing gyroscopic effect.