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Description

This ain’t nothin’ after that thundercloud in Last Roundup.

safe2174441 screencap295738 derpy hooves57508 doctor whooves11792 time turner11792 earth pony446368 pegasus496526 pony1602573 g42028959 slice of life (episode)1991 animated126030 bowtie15037 derpy being derpy249 discovery family1953 discovery family logo12628 doctor whooves' lab38 female1802788 male550750 mare741085 plasma ball55 stallion195691
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Comments

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Background Pony #DAAD
I like how Dr. Whooves doesn’t get irritated with Derpy interacting with his tinkerings.
Background Pony Number 17
My Little Pony - 1992 Edition

@ThruMuffin  
It’s a “plasma ball”. Same thing as a neon tube, really. The ball in the middle is one end of the circuit, and the glass inner wall is the other end. The ball is partially evacuated, and the voltage difference sends an arc like a miniature lightning bolt through the gas. When you touch it, that changes the local voltage difference which moves the arc.
 
Plasma balls shouldn’t raise your hair like this, though. The animators are mixing them up with Van de Graaf generators, which produce a strong voltage difference on a sphere and anything the sphere touches (like a person).
ThruMuffin

I remember seeing something like this tesla ball irl but i didn’t get energized at touch.. Anyway, i just loved the Derpiwhooves part of the episode