A toothless laugh

Have you ever came across one before?

It was like an ancient magic,
Silent,
Muted by age,
Triggered by a familiar joke from a familiar banter,
Where there was once fangs is now hollow,
Taken by the ferocity of gritted teeth,
The host was a body in a wheelchair,
With shuffling legs that cant stand too long or sit too long,
Eyes lost, untranslateable in a chorus of movement,
I've always wondered what they think of,
Are they alone in the crowd too?
Or is the crowd too familiar to be alone in?
I guess I'm too young to tell,
All I know is that day, I struggled to find life in all that heat and chaos,
When I came across it for the first time,
Beneath a sickly old woman without voice, teeth and strength,
Was a strange laugh that can be seen but not heard,
That was when I learnt that laughters are more for the eyes than the ears,
Because for that brief moment,
With a muted laughter,
She was the liveliest in the noisy crowd,
And the liveliest on that noisy day.