I was outside drinking coffee with a friend when I saw an extremely crippled man in his 30's pushing a shopping cart and collecting plastic water bottles. When my friend got up to throw something in the trash, he turned to her and exclaimed, "Have a wonderful day!"
When my friend sat back down next to me, I said to her, "He is an amazing person. Here's someone who has so much less than you, doing something that I would probably collapse under, and yet he had it in his heart and soul to perk up your day. He wasn't pouty. He wasn't hostile. He was cheerful. That was an amazing person who you just had talk to you."
A few minutes later, my friend looked at me and said, "That was a life-changing moment for me. Thank you for pointing that out."
We all have these life-changing moments. We need to take advantage of them and use them wisely.