I can't think of any except for "Red Fish Blue Fish, One Fish Two Fish". I need a good poem for psychology, though and I'm not happy with what the internet finds me.
Winken, Blinken, and Nod one night
Sailed off in a wooden shoe --
Sailed off on a river of crystal light,
Into a sea of dew.
"Where are you going, and what do you wish?"
The old moon asked the three.
"We have come to fish for the herring fish
That live in the beautiful sea;
Nets of silver and gold have we!"