The rules of life

[b1o]

1). Never smile at a crocodile
2). No, you can't get friendly with a crocodile
3). Don't be taken in by his welcome grin, he's imagining how well you'd fit within his skin
4). Never smile at a crocodile
5). Never dip your hat and stop to talk awhile
6). Never run, walk away, say good-night, not good-day, clear the aisle but,
7). Never smile at Mister Crocodile

1, 4 and 7 seemed a bit similar