Sense Sonnet - Tickler

What's Relative?

Einstein 'splained relativity
Of time, using two points of view
Of two guys - one standing near be
A moving train. The other who
Is on that train, sees lightening bolts
In two spots sequentially hit.
The other guy, on the ground, jolts,
Seeing two flashes same time hit.
Why did the guys not see the same?
The difference was motion made
As Einstein tried to 'splain his claim,
With two guys in visual aid.

Relativity's hard to 'splain
To a guy just hit by a train.