Never smile at a crocodile
No, you can't get friendly with a crocodile
Don't be taken in by his [bad word] grin
He's imagining how well you'd fit within his skin
Never smile at a crocodile
Never dip your hat and stop to talk awhile
 [bad word]  walk away, say good-night, not good-day
Clear the aisle but never smile at Mister Crocodile
You may very well be well bred
Lots ot etiquette in your head
But there's always some special case, time or place
To forget etiquette
For instance:
Never smile at a crocodile
No, you can't get friendly with a crocodile
Don't be taken in by his [bad word] grin
He's imagining how well you'd fit within his skin
Never smile at a crocodile
Never dip your hat and stop to talk awhile
 [bad word]  walk away, say good-night, not good-day
Clear the aisle but never smile at Mister Crocodile