Here’s one by Hilaire Belloc that I always liked.
A Python I would not advise.
It needs a doctor for its eyes
And has the measles yearly.
However, if you feel inclined
To get one (to improve your mind,
And not from fashion merely),
Allow no music near its cage;
And when it flies into a rage
Chastise it, most severely.
I had an aunt [...]

Little Willie from the mirror
Licked the mercury right off,
Thinking, in his childish error, it would cure the whooping cough.
At the funeral, his mother brightly said to Mrs Brown
“‘Twas a chilly day for Willie when the mercury went down!”