A colon can give a sentence an entirely different meaning.
For example:
Sentence 1: Johnny ate the chicken's liver.
...
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Ha ha ha ha ha ha ha ha ha ha ha! Thanks for the laugh! I needed that this morning. Welcome back. You have been silent for a while.
Thanks, Kim. You're right. It has been a while since I have logged in.
Cowboy, you made me laugh today. I'm sure you could add more to this. You are very clever.
Grace Diane, thank you so much for the comment. Comments mean a lot to me.
Instead of adding more to this 'poem' I have now posted 'Punctuation is Important 2'. Thanks for the suggestion.