My recipe for making people happy:

• Tell parents that their infant is beautiful.
• Tell neighbors that their dog is beautiful.
• Tell little children that their bikes are fantastic.

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Facebook friends append some ingredients to my recipe:

• “Little kids also like to know that you love their sneakers.” (thanks to S. M.)
• “Also, tell them their lemonade is good. Buy a second cup.” (thanks to @bfwriter)