A poem that I learnt in one English lesson nearly 40 years ago and stuck immediately

Eletelophony

Once there was an Elephant that tried to use the telephant
No, No, I mean an Elephone that tried to use the telephone
(Dear me! I am not certain quite
That even now I've got it right)

Howe'er it was, it got its trunk
Entangled in the telphunk
The more it tried to get it free
The louder buzzed the telephee!
(I fear I'd better drop the song
Of Elephop and telephong)