Here's one I wrote on insomnia which is written so that when read out loud it produces a Doppler effect. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Insomnia

Generally you’ll sleep through it

but on occasions of anticipation, heartache

or too much caffeine

you may find yourself lying awake

at 3:25 am and the world is silent

perfectly still longing for sleep

you may hear your heart beat

like the pendulum of a grandfather clock

in the next room

ear pressed against pillow

turned back in

listening

to your own blood flow

its echo the sound of the ocean

in a seashell

then in the distance

timpani drums, hundreds of them

muffled mallets bouncing off skins

like a heavy rain on canvas

marching closer and closer

their rhythms resonating in the pit of your stomach

giving way to the metallic clack and clatter

of steel wheel on rail

and then for an instant

the sky is full of train sound

and you’re awake

on this occasion of anticipation, heartache

or too much caffeine

then the wheels surrender

to the rain

and the rain bows to the tympanis

And the tympanis march away

leaving you with the sound

of the ocean in a seashell

but generally

you’ll sleep through it.

+++++++++++++++++++++

m. salinger